PURPOSE:To constitute integrated environment of design and evaluation which enable effective repetitive design of an interactive system. CONSTITUTION:An interactive evaluation device 106 reads design data out of a design data storage device 102 and an interaction history out of an interaction history storage device 104, and evaluates a designed interactive procedure. Consequently, design data wherein design elements which cause problems regarding easiness of use are specified are obtained. The data are stored in an evaluation data storage device 107. A system design device 101 reads in design data as the evaluation result stored in the evaluation data storage device 107 and uses the data directly for redesign for improving the easiness of use.
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