NEM: "novice expert ratio method" a usability evaluation method to generate a new performance measure

Authors:
Haruhiko Urokohara;Kenichi Tanaka;Kazuyoshi Furuta;Michiyo Honda;Masaaki Kurosu
Affiliations:
NOVAS Inc., Shibuya-ku, Tokyo, JAPAN;NOVAS Inc., Shibuya-ku, Tokyo, JAPAN;NOVAS Inc., Shibuya-ku, Tokyo, JAPAN;NOVAS Inc., Shibuya-ku, Tokyo, JAPAN;Shizuoka University, Hamamatsu, Shizuoka, JAPAN
Venue:
CHI '00 Extended Abstracts on Human Factors in Computing Systems
Year:
2000

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Abstract

NEM is a new evaluation method that generates a quantitative measure in terms of the usability of any specific system. In this method, at each step of the operational procedure in the situation of the usability testing, the ratio of time required for a novice user to that of an expert user is used to generate an NE ratio. The time required by the expert user is thought to represent the minimum time to operate the system. Hence, regardless of the absolute amount of time required by the user, the magnitude of the ratio can be regarded as a measure to represent the difficulty in using that system for the novice user. By applying this method to the evaluation of the car navigation system, it was confirmed that this method is quite useful in identifying the procedural step that has a usability problem.