Abstract
The Japanese engineering education is demanded now to possess engineering design education. However, this demand is accompanied with difficulty, because the problem that engineering design wrestles with is not the more or less simplified problems that engineering studies settled. Engineering design is the process of trial and error to break through the real situation including some various, vague, complicated and uncertain problems. Engineering design skill of engineer is ability to achieve this process. The engineering design process will be understood as an iterative process which is performed between two rationality; one rationality is internal-rationality which constitute the solution such as engineering science, and another is external-rationality in the meaning that the solutio Tn acts good for work place such as performance and conditions.
