Research on the influencing factors of promoting flipped classroom teaching based on the integrated UTAUT model and learning engagement theory

With the rapid advancement of educational technology, the flipped classroom approach has garnered considerable attention owing to its potential for enhancing students’ learning capabilities. This research delves into the flipped classroom teaching methodology, employing the Unified Theory of Acceptance and Use of Technology (UTAUT), learning engagement theory, and the 4C skills (comprising communication, collaboration, creativity, and critical thinking) to investigate its effects on learning capabilities. The research surveyed 413 students from three universities in Jiangxi Province, employing stratified random sampling. SPSS 24.0 and Amos were used for structural equation modeling and hypothesis testing analysis. The findings indicate that: (1) Performance expectancy, effort expectancy, and peer influence significantly enhance students’ learning engagement in the flipped classroom. (2) Students’ learning engagement in the flipped classroom notably promotes their learning capabilities. (3) Performance expectancy, effort expectancy, and peer influence can significantly boost learning capabilities by increasing learning engagement. (4) Personality traits significantly moderate the effect of peer influence on learning engagement, highlighting the crucial role of individual differences in learning. (5) The level of students’ learning engagement is differentially influenced by performance expectancy and peer influence across various academic disciplines. Ultimately, this research provides valuable insights for educational policymakers and guides improvements in teaching practices, collectively advancing educational quality and equity.

learning to align more closely with individual learning styles and paces 5,6 .Additionally, the impact of the flipped classroom on students' academic success has garnered considerable attention.Semab and Naureen 7 research demonstrates the positive effect of the flipped classroom model in enhancing students' academic achievements.Studies by Roehl et al. 8 and Tucker 9 emphasize that the flipped classroom promotes the cultivation of students' practical application abilities by reallocating classroom time for in-depth discussions, problem-solving, and hands-on activities.
Another area of research pertains to effective flipped classroom teaching design and the challenges it faces.Effective teaching design serves as the cornerstone of a successful flipped classroom.Nicholas 10 underscores multiple teaching factors to consider when implementing a flipped classroom in graduate education.Meanwhile, Yang et al. 11 designed a flipped classroom teaching model based on blended learning and experimentally verified the model's effectiveness in enhancing students' academic performance and level of learning engagement.For STEM education, Shofiyah et al. 12 proposed a flipped classroom teaching template grounded in the 5E model, the validity and reliability of its content and structure have also been verified.
The research findings from the two aforementioned aspects provide rich references and insights for this research, yet there are two gaps in existing research.On the one hand, although the flipped classroom teaching method has been widely studied, few studies have explored the impact of the flipped classroom on enhancing 4C skills (communication, collaboration, creativity, and critical thinking), using the 4C skills as a measure of learning capability.On the other hand, despite the general agreement in previous studies on the positive effects of the flipped classroom on learning outcomes, few have investigated the differing impacts of personality and subject differences in flipped classroom teaching.
Therefore, this research seeks to answer the following questions: Question 1: What are the key factors that affect students' learning engagement in the flipped classroom teaching method?Question 2: Does learning engagement further influence students' 4C learning capabilities?Question 3: Do individual differences (such as personality) and subject differences have a moderating effect between the relevant variables in this research?
To answer these questions, this research combines the UTAUT model, learning engagement theory, and the 4C skills analysis framework to construct a comprehensive research model.By collecting data from 413 students from three universities in Jiangxi Province, this research utilizes structural equation modeling for data analysis to unveil the complex relationships between performance expectancy, effort expectancy, peer influence, learning engagement, and learning capability in the flipped classroom.
The significance of this research lies not only in illustrating the specific impact of the flipped classroom on students' learning capabilities through empirical analysis, providing a scientific basis for the further promotion and application of this teaching model, but also in deepening the understanding of the essence of the flipped classroom teaching model by integrating multiple theoretical frameworks.Furthermore, the research findings will provide strong support for educational policy formulation and teaching practice improvement, collectively advancing educational quality and equity.
Compared to existing research, the innovation of this research is primarily reflected in model construction and variable setting.Firstly, while preserving the core variables of the UTAUT model, this research innovatively integrates learning engagement theory and the 4C skills framework, offering a new perspective for understanding the interactions of various factors in the flipped classroom and their impact on learning capabilities.Secondly, in terms of variable setting, this research includes personality traits and subject differences as moderating variables in the analysis and utilizes 4C skills as a measure of learning capabilities, which is a novel approach in the field of flipped classroom teaching research.
In the following chapters, this research will conduct a literature review, derive research hypotheses, describe the survey process, perform model inspection, and finally discuss and present research implications.

Theory and application of the UTAUT
The UTAUT model, proposed by Venkatesh et al. 13 , integrates key variables from multiple theoretical models, including the Theory of Reasoned Action (TRA), Theory of Planned Behavior (TPB), Technology Acceptance Model (TAM), Motivational Model (MM), Combined TAM and TPB (C-TAM), and Innovation Diffusion Theory (IDT).Its aim is to provide a more comprehensive and accurate framework to explain and predict users' acceptance behavior towards new technologies.
The dimensions of the UTAUT model have demonstrated strong explanatory power in technology adoption research across multiple domains, particularly in education.The model has been applied to studies on the acceptance behavior of technologies such as Massive Open Online Courses (MOOCs) and AI chatbots.Li and Zhao 14 combined the UTAUT model with Social Presence Theory to analyze factors influencing students' continued use of MOOCs, finding that the UTAUT model positively affects students' satisfaction and intention to continue using MOOCs.Meanwhile, Tian et al. 15 utilized both UTAUT and ECM models to explore Chinese graduate students' acceptance and utilization of AI chatbot technology, discovering that "confirmation" and "satisfaction" from the ECM model have a greater impact on user behavior than the UTAUT model.
The flipped classroom, as an innovative teaching model in higher education, has garnered significant attention regarding its application effects and influencing factors.In this domain, both Alyoussef 16 , Agyei and Razi 17 have conducted in-depth explorations utilizing the UTAUT model.Alyoussef 16 revealed the central mediating role of perceived usefulness and perceived ease of use in students' acceptance of the flipped classroom, using a sample of students from a university in Saudi Arabia.This finding not only indicates students' positive attitude towards the flipped classroom but also further confirms the positive role of this teaching model in enhancing learning outcomes.Agyei and Razi 17 enriched the UTAUT model by introducing variables such as experience expectancy, parent-school involvement, perceived behavioral control, and self-efficacy to deeply analyze high school students' acceptance of using online resources for flipped classroom learning.Their results showed that performance expectancy, effort expectancy, parent-school involvement, students' self-efficacy, and experience expectancy all significantly positively impact students' willingness to learn.However, perceived behavioral control did not show a significant effect in their research.
In this research, we focus on the college student population whose social connections are primarily reflected in peer relationships.Therefore, we choose to represent the social influence element in the UTAUT model with the peer influence, aiming to be more aligned with the actual situation of this specific group.Meanwhile, considering the widespread popularity of technology in modern higher education, we do not consider facilitating conditions as a core factor in our research, although this does not imply that this element can be ignored in all environments.

Learning engagement theory
Learning engagement theory, initially proposed by Fredricks et al. 18 in the field of educational psychology, aims to delve into students' cognitive, emotional, and behavioral engagement exhibited during the learning process.This theory focuses on assessing the enthusiasm and depth of students' participation in learning activities, encompassing three key dimensions: cognitive engagement, emotional engagement, and behavioral engagement.
In the process of deeply exploring the theory of learning engagement, researchers have conducted extensive studies targeting different educational environments and learning formats.The issue of learning engagement is particularly prominent in the field of MOOCs and online learning.Although MOOCs have attracted a large number of learners due to their openness and flexibility, the low completion rate has always been one of the challenges they face 19 .Studies have shown that students' intrinsic motivations (such as interest) and extrinsic motivations (such as perceived knowledge value) have a significant impact on their learning engagement in MOOCs.From the perspective of self-determination theory, Lan and Hew 20 research adopted a mixed-method approach to investigate learning engagement in MOOCs.The study found that perceived ability and emotional engagement have a significant impact on students who complete MOOCs, and different dimensions of learning engagement can predict learners' perceived learning effectiveness.Meanwhile, in the online learning environment, significant changes have occurred in the way students interact with teachers and peers, which requires educators to pay more attention to cultivating students' autonomous learning abilities, computer and network skills, and online communication abilities to promote their learning engagement 21 .

Related research on the 4C skills analysis framework
Voogt et al. 22 emphasized the importance of 4C skills in 21st-century education in their study.These skills include Communication, Collaboration, Creativity, and Critical Thinking, which focus on cultivating students' comprehensive literacy to adapt to the complex needs of modern society.Especially when measuring learning capability, the 4C skills provide a comprehensive and appropriate framework.
In the context of exploring the improvement of learning abilities, integrating these four skills-critical thinking, communication, collaboration, and creativity-into the learning process is particularly critical.Specifically, critical thinking skills enable learners to identify true and false information and adapt to environmental changes 23 .Communication skills, including effective speaking, listening, and writing, are key to improving interpersonal efficiency 24 .Collaboration emphasizes working together in a team environment, facilitating knowledge sharing and problem-solving 25 .Innovation ability is the key to gaining an advantage in modern social competition, requiring continuous learning, challenging traditional concepts, and maintaining sensitivity to new technologies 26 .By integrating these abilities, the learning process can be more comprehensive, improving flexibility and effectiveness in responding to various challenges.
Although previous studies have explored the role of the flipped classroom model in promoting student collaboration, criticism, and innovation abilities 9,27 , there is still a lack of in-depth exploration of the specific impact and mechanism of communication ability in this model.Therefore, this research aims to comprehensively integrate 4C abilities and deeply explore the overall impact of the flipped classroom teaching model on these abilities.
This research combines the UTAUT model, learning engagement theory, and the 4C theory, selecting Performance expectancy (PE), Effort expectancy (EEX), Peer influence (PI), Learning engagement (ENGA), and Learning capability (SKIL) as research constructs to explore the impact mechanism of flipped classroom teaching on college students' learning capability.The specific definitions of the variables are shown in Table 1:

Hypothesis derivation
The relationship between performance expectancy, effort expectancy, peer influence, and learning engagement Singh 28 , Riddle and Gier 29 and Clark 30 and other scholars have found that flipped classrooms can improve students' test scores and course engagement by replacing traditional lectures with micro-lectures and activitybased learning strategies, thus demonstrating that performance expectancy have a significant positive impact on students' engagement in learning.The fully online flipped classroom model was more effective than the online flipped model in supporting student behavioral engagement, suggesting the importance of effort expectancy in an online environment 31 .Ruiz 32 study demonstrated that integrating interactive technology and peer instruction into a flipped classroom can positively affect student engagement, i.e., the importance of peer influence in enhancing student engagement and learning.Based on the above, the following hypotheses are proposed in this research: H1 Performance expectancy has a significant positive impact on students' learning engagement.

The relationship between learning engagement and learning capability
Learning Engagement Theory emphasizes the cognitive, emotional, and behavioral engagement of students in the learning process and these factors are believed to positively influence the enhancement of learning capabilities.Zimmerman 33 states that when students believe they can succeed in a learning task, they are more likely to invest more energy and effort, which promotes learning capabilities.Pekrun et al. 34 explored the relationship between students' engagement in learning and learning competence from an emotional perspective, which further supports the positive link between engagement in learning and increased learning competence.Martin and Bolliger 35 noted that student engagement in learning directly impacts online learning outcomes, improves student performance in online programs and is considered an important factor in measuring teaching quality.Taken together, these studies suggest that learning engagement can have a significant positive impact on students' learning capabilities by influencing their self-efficacy, motivation, learning strategies, and emotional engagement.Based on the above, this research proposes the following hypotheses: H4 Students' learning engagement has a significant positive impact on learning capability.

The mediating role of learning engagement
According to the aforementioned literature, it is evident that performance expectancy, effort expectancy, and peer influence have a positive effect on the enhancement of learning capabilities through learning engagement.This is supported by studies from Chen and Wu 36 , Buabeng-Andoh 37 , Kuo et al. 38 , Zimmerman 33 , Pekrun et al. 34 , and Martin and Bolliger 35 .Additionally, research by Jamaludin and Osman 39 , Wang 40 , and Nerantzi 41 also corroborate the notion that performance expectancy, effort expectancy, and peer influence impact learning capabilities through learning engagement.Based on this information, the current study proposes the following hypotheses: H5 Performance expectancy has a significant positive impact on learning capability through students' learning engagement.
H6 Effort expectancy has a significant positive impact on learning capability through students' learning engagement.
H7 Peer influence has a significant positive impact on learning capability through students' learning engagement.

Personality
Personality is a relatively stable individual difference in behavior, emotion, and cognition exhibited by an individual that encompasses traits, habits, attitudes, and values.Eysenck and Eysenck and Eysenck 42 Proposed the introversion-extraversion theory to explain and describe individual personality differences, which divides human personality into two types: introverted and extroverted.Chuang et al. 43 , Kim et al. 44 and other scholars explored the differences in classroom performance of students with different personality traits in a flipped classroom, with Wang et al. 45 noted that students with moderate openness performed best in flipped classrooms, while students with high openness performed best in online learning situations.However, there are relatively few studies on personality as a moderating variable in the UTAUT model because UTAUT focuses primarily on technology acceptance and use behaviors, while individual differences, including personality, are usually more prominent in other models.Combined with the traits of the subjects under study, introverted students may be more inclined to show higher learning engagement in independent learning environments, while extroverted students may be  13 , Chen and Wu 36 , Clark 30 , Riddle and Gier 29 , Singh 28 , Plageras et al. 58 Effort expectancy (EEX) University students' perceived difficulty in mastering the skills and knowledge required for the flipped classroom Chen and Wu 36 , Jia et al. 31 , Plageras et al. 58 Peer influence (PI) In the flipped classroom environment, students' perspectives on using this teaching model and its influence on individual choices Chen and Wu 36 , Kissi et al. 59 , Ruiz 32 , Plageras et al. 58 Learning engagement (ENGA) The level of active participation of university students in the flipped classroom, encompassing three aspects: cognitive engagement (CE), emotional engagement (EEN), and behavioral engagement (BE) Zimmerman 33 , Martin and Bolliger 35 , Tang and Hew 60 Learning capability (SKIL) The ability of students to acquire and apply knowledge and skills through the flipped classroom, including four aspects: critical thinking (CT), communication (CS), creativity (CREA), and collaboration (CSK) Voogt et al. 22 , Tucker 9 , Zainuddin and Halili 27 , Sari and Wardhani 24 , Nuraini et al. 26 ,Solichah et al. 23 , Pratama et al. 25 Vol.:(0123456789) www.nature.com/scientificreports/more adept at collaborating with peers, therefore, the variable of personality is added as a moderating variable in this study.Based on the above, the following hypotheses are proposed in this research: H8A Personality has a moderating effect between performance expectancy and learning engagement.
H8B Personality has a moderating effect between effort expectancy and learning engagement.
H8C Personality has a moderating effect between peer influence and learning engagement.
H8D Personality has a moderating effect between learning engagement and learning capability.

Subject
Based on the perspective of individual differences, subject differences may have different impacts on students' engagement and learning capabilities in the flipped classroom environment.Liu et al. 46 explored the impact of a flipped classroom integrating subjects on student learning capabilities in different health professional fields.Meanwhile, Fan 47 explored the application of social influences, school motivation, and gender differences in educational psychology and found that disciplinary background may influence student motivation and engagement.Students may exhibit different learning preferences and strategies in humanities and social sciences and science and technology disciplinary contexts.Meanwhile, subject differences in the UTAUT model have been investigated by focusing on the similarities and differences in individuals' acceptance of technology in different subject areas.Therefore, this research proposes the following hypotheses about the moderating effects of disciplinary differences: H9A Discipline has a moderating effect between performance expectancy and learning engagement.
H9B Subject has a moderating effect between effort expectancy and learning engagement.
H9C Subject has a moderating effect between peer influence and learning engagement.
H9D Subject has a moderating effect between learning engagement and learning capabilities.
Taking the above into account, a theoretical model can be constructed about the enhancement of students' learning capabilities by flipped classroom teaching, which is shown in Fig. 1. www.nature.com/scientificreports/

Collection method
This research employed a questionnaire survey for data collection.The survey was conducted from November to December 2023, targeting students who had participated in flipped classroom learning in three universities in Jiangxi Province.To ensure the representativeness and breadth of the sample, the research team adopted a stratified random sampling method.A total of 450 eligible students were selected as survey respondents.This sampling strategy aimed to ensure that the sample comprehensively reflected the characteristics and opinions of students at different levels, thereby enhancing the reliability and validity of the research.
During the survey process, a detailed questionnaire was distributed to each participating student, and they were offered a cash incentive to encourage honest and thoughtful responses.Through this approach, we hoped to gather high-quality data that truly reflected students' flipped classroom experiences, providing a solid foundation for subsequent analysis and research.
A total of 450 questionnaires were distributed, with 418 returned (93% response rate) and 413 valid questionnaires ultimately obtained (99% validity rate).Throughout the questionnaire distribution process, we strictly adhered to ethical principles in academic research, particularly regarding obtaining informed consent from participants.All students participating in this research were clearly informed about the purpose, methodology, potential risks, and their rights related to this research.

Collection instruments
The questionnaire employed a 7-point Likert scale, with the numbers 1, 2, 3, 4, 5, 6, and 7 representing "strongly disagree, " "disagree, " "somewhat disagree, " "neutral, " "somewhat agree, " "agree, " and "strongly agree, " respectively."Strongly disagree" indicates that the situation described in the item completely contradicts reality, "strongly agree" indicates complete agreement with reality, and "neutral" indicates a middle ground.The research tool used in this research consists of six parts.The first part is a questionnaire on student background variables (including subject, personal personality, etc.).The second part is a performance expectancy questionnaire, adopting questionnaire content designed by Devisakti and Ramayah 48 and others for performance expectancy.It focuses on specific measurement items for university students' performance expectancy of flipped classrooms and consists of 4 questions.The third part is an effort expectancy questionnaire, utilizing content designed by Zou et al. 49 and others for effort expectancy.It aims to measure specific aspects of university students' effort expectancy in flipped classrooms and includes 3 questions.The fourth part is a peer influence questionnaire, based on content designed by Zhonggen and Xiaozhi 50 , Khlaisang et al. 51 , and others.It measures specific aspects of peer influence in flipped classrooms for university students and comprises 3 questions.The fifth part is a learning engagement questionnaire, using content designed by Qureshi et al. 52 .This section includes behavioral, emotional, and cognitive engagement as sub-dimensions and aims to measure specific aspects of university students' learning engagement in flipped classrooms with 12 questions.The sixth part is a personal capability enhancement questionnaire, employing content designed by Arshad and Akram 53 , C.-H. S. Liu 54 , Baruch and Lin 55 and others.It includes sub-dimensions such as communication skills, cooperation skills, innovation skills, and critical thinking skills, aiming to measure specific aspects of personal capability enhancement in university students after learning in flipped classrooms, with 16 questions.

Demographic analysis
In this research, data collection resulted in the recovery of 418 questionnaires.After discarding 5 invalid samples, 413 valid samples remained.The basic characteristics are shown in Table 2.The primary data collected in this research includes subjects and personal personality traits.Among the 418 surveyed students, 199 were from science and engineering, accounting for 48.18% of the total; 214 were from humanities and social sciences, accounting for 51.82%.In terms of personality traits, 201 students were introverted, accounting for 48.67% of the total, while 212 students were extroverted, representing 51.33% of the total.

Model inspection and results
In this research, SPSS 24.0 and AMOS software were used to perform structural equation modeling analysis on the data to explore the impact of flipped classroom teaching on students' learning abilities.The analysis primarily consists of two parts: the measurement model (including reliability testing, convergent validity testing, and discriminant validity testing) and the structural model (including model fit analysis, path analysis, mediation effect analysis, and moderation effect analysis).www.nature.com/scientificreports/

Measurement model analysis
Questionnaire reliability test Table 3 presents the internal consistency of the questionnaire dimensions.The internal consistency (Cronbach's α) of all dimensions is higher than 0.7, indicating good reliability of the questionnaire sample data.All items will be retained for subsequent analysis.

Convergence validity test
Table 4 presents the standardized factor loadings of each measurement item, as well as the composite reliability and average variance extracted (AVE) for each dimension.The standardized factor loadings range from 0.648 to 0.851, the composite reliability falls between 0.806 and 0.913, and the AVE is between 0.58 and 0.683.These values meet the criteria established by Fornell and Larcker 56 , indicating good convergence validity of the research.

Discriminant validity
This research employed the Average Variance Extracted approach to evaluate the discriminant validity.In order to have sufficient discriminant validity, each construct's square root of the AVE should be greater than the correlation coefficients between the constructs, according to Fornell and Larcker 56 .Table 5 displays the data demonstrating that the square roots of the AVEs for each of the components are higher than the associated correlation coefficients.The good discriminant validity of the model is confirmed by this finding.Make sure every research concept is unique and not just a reflection of other variables in the model by using discriminant validity.

Model fit
The values of the model fit indices for the structural equation model fall within an acceptable range, as Table 6 shows.Values fewer than 3 or 5 (depending on the criterion employed) are generally considered suggestive of a good fit, therefore the χ 2 /DF value of 1.002 is desirable.A excellent match is shown by the RMSEA value of 0.002, which is significantly less than the typical threshold of 0.08.A good model fit is indicated by the SRMR value of 0.038, which is less than the suggested maximum of 0.08.Both the CFI and the TLI values of 0.999 and 0.999 are near to 1, indicating a very good fit to the data.A good model fit is further confirmed by the values of the GFI and AGFI, which are 0.938 and 0.933, respectively, above the generally recognized criterion of 0.90.Together, these fit indices imply that the structural equation model provides a good match to the data, indicating that the model accurately captures the observed data.

Path analysis
According to the path coefficient analysis results presented in Table 7 and Fig. 2, Performance Expectancy (PE) (b = 0.244, p < 0.001), Effort Expectancy (EEX) (b = 0.284, p < 0.001), and Peer Influence (PI) (b = 0.242, p < 0.001) all have a significant positive impact on Learning Engagement (ENGA).Furthermore, Learning Engagement (ENGA) also significantly and positively affects the Learning Capability (SKIL) (b = 0.838, p < 0.001).Therefore, hypotheses H1, H2, H3, and H4 are supported.Furthermore, the findings show that whereas learning engagement accounts for 72.5% of the variance in the improvement of learning skills, performance expectancy, effort expectancy, and peer influence collectively account for 76.6% of the variance in learning engagement.These results underline the significance of Performance Expectancy, Effort Expectancy, and Peer Influence in determining Learning Engagement and validate the research hypothesis.Additionally, they attest to the importance of learning engagement in improving learning capability.This emphasizes how important these factors are to the flipped classroom learning environment and how they all work together to enhance student learning capabilities.

Mediation effect
Based on the indirect effects analysis in the mediation model shown in Table 8, it is noticed that the p-values are significant and the confidence intervals do not include 0 in all three mediated hypothesis paths www.nature.com/scientificreports/(PI → ENGA → SKIL, EEX → ENGA → SKIL, and PE → ENGA → SKIL).This indicates that the mediation effects are valid in all cases.Specifically: PE has a significant indirect effect on the enhancement of SKIL through ENGA, supporting Hypothesis H7.EEX has a significant indirect effect on the enhancement of SKIL through ENGA, supporting Hypothesis H6.PE has a significant indirect effect on the enhancement of SKIL through ENGA, supporting Hypothesis H5.
These findings demonstrate the critical role of ENGA as a mediator in the relationship between PE, EEX, PI, and the enhancement of SKIL.This supports the theoretical framework proposed in the research, highlighting the importance of these constructs in the context of flipped classroom learning environments.www.nature.com/scientificreports/

Moderating effect
When considering individual personality as a moderating variable, among the 413 respondents, there were 201 introverted students and 212 extroverted students.Table 9 presents the regression coefficient values for the two groups, showing the comparison of slope differences between them.Table 10 displays the moderation effect test of the model.Among the four cross-group comparisons of slopes, the path of PI → ENGA reaches a significant level, indicating that the moderation effect is partially established, thus confirming Hypothesis H8C.From the values in Table 9, it can be observed that the regression coefficient of PI → ENGA for introverted students is significantly higher than that of extroverted students.When considering the subject as a moderating variable, among the 413 respondents, there were 199 science and engineering students and 214 humanities and social science students.Table 9 shows the regression coefficient values for the two groups, representing the comparison of slope differences between them.Table 10 presents the moderation effect test of the model.Among the eight cross-group comparisons of slopes, the paths of PE → ENGA and PI → ENGA reach significant levels, indicating that the moderation effect is partially established, thus confirming Hypotheses H9A and H9C.From the values in Table 9, it can be seen that the regression coefficient of PE → ENGA for science and engineering students is significantly higher than that of humanities and social science students, while the regression coefficient of PI → ENGA for humanities and social science students is significantly higher than that of science and engineering students.

Main Research Findings and Conclusions
Based on Table 11, the main findings of this research are as follows: (1) The four main effect hypotheses, H1, H2, H3, and H4, are validated.Analyses confirming H1, H2, and H3 demonstrate that Performance Expectancy, Effort Expectancy, and Peer Influence significantly positively influence Learning Engagement, aligning with research by Singh 28 , Riddle and Gier 29 , Clark 30 , Jia et al. 31 , and Ruiz 32 .The validation of H4 shows that Learning Engagement significantly positively impacts Learning Capability, consistent with Pekrun et al. 34 , Zimmerman 33 , and Martin and Bolliger 35 .(2) The three mediation effect hypotheses, H5, H6, and H7, are supported.Analyses for H5, H6, and H7 indicate that Performance Expectancy, Effort Expectancy, and Peer Influence significantly and positively influence Learning Capabilities through Learning Engagement, aligning with findings by Jamaludin and Osman 39 , Wang 40 , Kobayashi 57 , and Nerantzi 41 .(3) The two moderating effect hypotheses, H8C, H9A, and H9C, are validated.Analysis for H8C shows a significant moderating effect of personality between Peer Influence and Learning Engagement, consistent with Wang et al. 45 .Analyses for H9A and H9C reveal significant moderating effects of the subject field on the paths from Performance Expectancy to Learning Engagement and Peer Influence to Learning Engagement, echoing Fan 47 .

Main research conclusions
(1) Performance expectancy, effort expectancy, and peer influence notably enhance students' learning engagement in the flipped classroom teaching.Performance expectancy encourages students to set specific learning goals, work towards achieving them, and believe in their potential to excel academically, thereby increasing their focus and dedication to studies.At the same time, a clear understanding of the required effort makes students appreciate every moment in the flipped classroom, fully investing themselves in the learning experience.Moreover, peer influence is essential as students collaborate and interact, fostering a supportive learning environment that further fuels their motivation and boosts learning engagement.(2) Students' learning engagement in the flipped classroom teaching significantly enhances their learning capabilities.Highly engaged students exhibit more active participation in class discussions, thereby refining their oral expression and improving their communication skills for smoother and more efficient interactions.Additionally, the flipped classroom frequently necessitates group work, fostering a sense of teamwork and collaboration among students.Through rigorous reflection and problem-solving exercises, students cultivate critical thinking abilities, allowing them to objectively and comprehensively analyze issues.Moreover, the flipped classroom underscores independent learning and exploration, thus motivating students to tackle problems from diverse perspectives and stimulating their innovative thinking and creativity.As a result, students who demonstrate high engagement in the flipped classroom achieve not only academic excellence but also substantial improvements in their communication, collaboration, critical thinking, and creativity skills.(3) Performance expectancy, effort expectancy, and peer influence can significantly enhance learning capability by increasing learning engagement.Clear performance expectancy fuels students' motivation, keeping them laser-focused on learning tasks.To achieve better outcomes, students become proactive in communicating with peers and teachers, thus honing their communication skills.Additionally, they collaborate more with classmates to solve problems, strengthening their teamwork abilities.Effort expectancy helps students

H8C
Personality has a moderating effect between peer influence and learning engagement Supported H9A Subject has a moderating effect between performance expectancy and learning engagement Supported H9C Subject has a moderating effect between peer influence and learning engagement Supported understand that to reach their learning goals, consistent effort is key.This realization sharpens their critical thinking and drives them to continuously refine their learning methods.In this journey, students also experiment with novel learning strategies, fostering creativity.Moreover, peer influence plays a pivotal role in shaping the learning environment.Mutual encouragement and imitation among peers create a positive atmosphere, prompting deeper engagement and significantly boosting students' communication, collaboration, critical thinking, and creativity skills.(4) Personality plays a significant moderating role in the impact of peer influence on learning engagement, emphasizing the role of individual differences in learning.Our personality traits guide us in choosing our peers, often leading similar-minded students to form study groups.This, in turn, shapes the way peers influence each other and how engaged they are in learning through unique interaction styles.Additionally, our personalities determine our preferred learning methods.Extroverted students, for example, might enjoy learning through group discussions and hands-on activities, while introverted students might prefer solo research and quiet reading.These personality-driven choices further shape our attitudes, motivation, and how we handle learning challenges.(5) In various subject areas, students' learning engagement is influenced differing extents by performance expectancy and peer influence.The level of difficulty of the subjects and the students' personal interests directly shape their performance expectancy.For instance, the abstract logic in science and engineering subjects may pose a challenge to students, influencing their expectations, while the memorization and comprehension in humanities and social sciences may be relatively easier, leading to more optimistic Performance Expectancy.Additionally, subject characteristics shape Peer Influence, as problem-solving in science and engineering subjects and text interpretation in humanities and social sciences subjects guide different peer interaction patterns.These differences create distinct competitive and collaborative atmospheres among peers, ultimately impacting students' Learning Engagement.

Research Contributions
(1) One of the significant contributions of this research is the substantial enhancement and expansion of the Unified Theory of Acceptance and Use of Technology (UTAUT) model's application in the flipped classroom environment, providing crucial theoretical and practical insights to the field of education.By integrating variables such as performance expectancy, effort expectancy, and peer influence, and incorporating learning engagement and learning capability into the model, this research innovatively constructs an improved UTAUT model.This not only verifies the direct impact of these variables on learning capability but also reveals the mediating role of learning engagement.The research underscores the importance of performance expectancy, effort expectancy, and peer influence in promoting deep learning, active participation, and enhancing learning capabilities, especially in autonomous learning environments like flipped classrooms.These findings offer empirical evidence for understanding and improving flipped classroom design and provide educators with critical information for designing and implementing more effective strategies.(2) The second contribution of this research is demonstrating that learning engagement has a significant positive impact on learning capability, highlighting its central role in students' learning processes.This finding has important implications for educational practice, providing a basis for improving flipped classroom design and emphasizing the necessity of deep learning engagement.(3) The third contribution lies in exploring how personality and disciplinary backgrounds moderate the effects of peer influence and learning engagement, as well as the impact of performance expectancy on learning engagement.This offers a unique perspective for understanding the influence of individual and disciplinary differences on learning.Furthermore, the model's innovation lies in its focus on not only the impact of peer influence and performance expectancy on learning engagement but also the moderating effects of personality traits and disciplinary backgrounds.Thus, this research theoretically enhances the empirical foundation of educational psychology and behavioral science, opening new avenues for future educational practice and research.It stimulates research on optimizing learning environments by considering individual and disciplinary characteristics and provides guidance for educators on how to design and improve courses, helping students with different personalities and disciplinary backgrounds better adapt to flipped classrooms.

Suggestions
Strategies for implementing flipped classrooms in practice Successfully translating flipped classroom research findings into teaching practice is a gradual process.This process requires teachers to comprehensively and deeply understand the teaching philosophy and methods of the flipped classroom, fully recognizing its significant advantages in enhancing students' learning initiative and deep engagement.Subsequently, based on specific course content and students' actual needs, teachers should carefully plan and create preview videos aimed at stimulating students' curiosity and effectively imparting core knowledge.In the classroom environment, teachers should create diversified interactive learning activities, such as group discussions, role-playing, or experimental operations, aimed at promoting students' internalization and application of the learned knowledge.Simultaneously, establishing an efficient feedback system is crucial to enable teachers to grasp students' learning progress and encountered problems in real-time, providing precise guidance and support.This series of processes smoothly transitions the research results of the flipped classroom into practical teaching strategies, thereby significantly improving teaching quality and optimizing students' learning outcomes.

Figure 1 .
Figure 1.Theoretical model of flipped classroom teaching to enhance students' learning capability.

Table 1 .
Operational definitions of research variables.

Table 5 .
Discriminant validity.A footnote to explain the [bold] values has been added to table[5].Please could you confirm the footnote?Or, confirm that we should remove the [bold] and the footnote from the table?

Table 6 .
Model fit.Regression coefficients.DV stands for the dependent variable, IV stands for the independent variable, Unstd stands for unstandardized, S.E.stands for standard error, p-value stands for p-value, Std.stands for standardized regression coefficients, and R 2 stands for the amount of explainable variance.

Table 8 .
Analysis of the indirect effects of the intermediary model.

Table 9 .
Regression estimates of moderating effects.A footnote to explain the [bold] values has been added to table[9].Please could you confirm the footnote?Or, confirm that we should remove the [bold] and the footnote from the table?

Table 10 .
Difference in path coefficients of the regulation effects.NPAR, number of parameters.A footnote to explain the [bold] values has been added to table[10].Please could you confirm the footnote?Or, confirm that we should remove the [bold] and the footnote from the table?

Table 11 .
Presentation of research results.