As the Web becomes more popular, the interest in effective navigation is increasing. Menu design is becoming a critical issue of human computer interface design as the focus of computer applications moves from the computer as a machine to the human as a user. The purpose of this study was to investigate the effect of three different Web menu designs-simple selection menu, global and local navigation aid menu, and pull-down menu-on the users' perception and information seeking performance. Three Cyber-Shopping Mall Web sites were developed for the experiment. These Web sites had the exact same content but each had a different menu design with a constant information structure. The result showed that overall information seeking performance was best in the pull-down menu. Participants performed better in searching with the pull-down menu but were faster in browsing with the global and local navigation aid menu. However, there was no significant difference between users' perception and the three menu designs. (Contains 31 references.) (Author/AEF)