This paper presents non-clinical evaluation of the KAIST-Ewha Colonoscopy Simulator II. Thirty one engineering-major students with no medical background were divided into two groups after they had been given instruction on colonoscopy and its operation. The baseline evaluation showed that both groups were equivalent in the level of the colonoscopy skills. The simulation-trained group underwent training until they passed all the performance criteria established by colonoscopy experts. Results of final evaluation showed that the simulation-trained group noticeably improved their skills.