Johnson C M, Johnson T, Zhang J
University of Texas M.D. Anderson Cancer Center, University of Texas School of Allied Health Sciences, Department of Health Informatics, Houston, Texas, USA.
Proc AMIA Symp. 2000:394-8.
The usability problems of a system often occur due to inattention to well-documented and well-established design guidelines and heuristics. These problems often lead to increased errors, user dissatisfaction, and often user abandonment. Although there are a plethora of design principles, programs are still being constructed without integration of these principles. One family history-tracking program was examined for usability compliance. In addition to a user analysis, a task analysis was conducted comparing the designers' conceptualization of tasks with the users' conceptualization of these tasks. A cognitive walk-through was then conducted on these tasks. Finally, a keystroke level model was used to show the differences between the execution times of these tasks. This model showed a serious mismatch between the designers and users conceptions of the task. The suggested redesign showed timesaving for each of these tasks.
系统的可用性问题常常是由于忽视了记录完备且已确立的设计准则和启发式方法而出现的。这些问题往往会导致错误增加、用户不满，而且常常会导致用户放弃使用。尽管有大量的设计原则，但程序在构建时仍未融入这些原则。对一个家族病史追踪程序进行了可用性合规性检查。除了用户分析之外，还进行了任务分析，将设计者对任务的概念化与用户对这些任务的概念化进行比较。然后对这些任务进行了认知走查。最后，使用击键级模型来展示这些任务执行时间之间的差异。该模型显示设计者和用户对任务的概念存在严重不匹配。建议的重新设计表明这些任务中的每一项都节省了时间。
