Table 1.

Errors in Study 1 and Study 2: Navigation errors–failure to locate functions, excessive keystrokes to complete a function, failure to follow recommended screen flow; Presentation errors–failure to locate and properly act upon desired information in screens, selection errors due to labeling ambiguities; Control usage problems–improper entry field usage.

Errors		Study 1	Study 2
Navigation errors		36	5
	Could not locate or use navigation button	36	5
Presentation errors		84	45
	Could not locate data entry feature–missed it	57	33
	Feature did not appear how user expected it to	15	5
	Reason for feature not understood	12	7
Control usage errors		92	92
	Had trouble using data entry feature	85	80
	Entered data in wrong location	5	10
	Data entry was not done as user would like it to be	2	2
Program crashed		0	2
Total errors		212	144