Meta-cognitive is defined simply as cognition about cognition. Through our daily experiences, we notice that we did as higher level some activities than usual cognition. On the other hands, management of university hospital nursing pointed out difficulties of instruction for self-regulated learning in hospital. One reason is considered that teaching method for meta-cognitive skill has not yet been established enough when compared with cognitive skill. We have held workshops in university hospital nursing department since 2010. We organized a learning model which promotes reflective learning of the case-method for medical service education. As an implementation of the learning model, we established a learning environment that supports learners to reflect on their thinking process in their experiences by a learning strategy which consists of three case-writing phases: the description phase, the cognitive conflict phase, and the knowledge building phase. In this paper, we describe an analysis of learners' errors in the workshop and design of error detection system to assist a tutor's reviewing.