**Human Technology Dep., R&D Division, YAMAHA MOTORCo. Ltd. Abstract: Based on the assumption that 1. 10 guidelines given tothe evaluator in the heuristic evaluation (HEM) developed by Nielsen(1993) is not covering enough the whole range of usability problems,2. but at the same time, a large number of guideline items should notbe given to the evaluator at the same time because of the distractionof