Examining basic items of a screen design

Permissionto makedigilallhard copiesof all or pall of this nmtwial for personal or classroom usc is granwd without fw provided that the copies a~e not made or dislribu(cd fbr profit or cw!urwrcial advtmmge. the copyright notice, the title of the publication and its date appear, and notice is given that copyright is by permission of the AChf, inc. To copy othwwise, to repubtish, to post on awvei.s or to redk+tributc 10 lists, rvquircs spcc i tic permission and/or fee. CHI ’96 Companion, Vancouver, BC Canada @ 1996 ACM ()-89791 .83 Q-1)/96/()4, ,$3.50 Method 25 alphabets (5 each of A, B, C, D, E) were displayed on a 5x5 grid on a CRT screen. (see tig.2) One alphabet was highlighted at a time. The highlight changed every five seconds. Five methods of hilighting were used underline, grey colour, bold, reverse video, and frame. (see fig. 1) Subjects clicked on the mouse as soon as they saw a hilighted alphabet on the screen. They were asked to react as quickly and precisely as possible. There was a total of 125 conditions with 5 kinds of highlights in 25 possible locations. Subjects sat at eye level in front of the centre of the CRT screen. The distance between the eyes and the screen was 30 cm. The reaction time, number of errors, and subjective evaluation were recorded.