Abstract
When we create new concept for new products, many of Japanese companies rarely validate the concept, in spite of importance for efficient product developing. Also we are not familiar with suitable approach for validation. This paper compared 2 approaches for validation, general method, asking directly user's intension of usage and our original method, “experience in daily life” for new concept X. “Experience in daily life” method can know really value of new experience and can find user's acceptability from social and psychological point of view. But general method has risk to lead wrong forecast of user's acceptability.
