Peute L W P, De Keizer N F, Van Der Zwan E P A, Jaspers M W M
Department of Medical Informatics, Academic Medical Center - University of Amsterdam, The Netherlands.
Stud Health Technol Inform. 2011;169:925-9.
Interactive Health Information systems are often considered cognitively complex by their users, leading to high cognitive burden and increased workload. This paper explores if Think Aloud usability testing provides valuable input to effectively redesign a web-based Data Query Tool in Intensive Care and to reduce physicians' cognitive workload during system interaction. Pre and post redesign usability testing demonstrated a major reduction in the cognitive task workload after redesign of the tool. Classification of revealed usability problems by means of the User Action Framework pointed out that usability problems related to the cognitively planning of actions by system users foremost affected cognitive task workload. This result may support Health Information system (re)design efforts on how to tackle the system's cognitive complexity and in so doing improve on its usability.
交互式健康信息系统通常被其用户认为在认知上很复杂，从而导致高认知负担和工作量增加。本文探讨出声思维可用性测试是否能提供有价值的输入，以有效地重新设计重症监护中的基于网络的数据查询工具，并减少医生在系统交互过程中的认知工作量。重新设计前后的可用性测试表明，该工具重新设计后认知任务工作量大幅减少。通过用户行动框架对所发现的可用性问题进行分类指出，与系统用户行动的认知规划相关的可用性问题对认知任务工作量影响最大。这一结果可能有助于健康信息系统（重新）设计工作，以解决系统的认知复杂性问题，从而提高其可用性。
