Designing the user interface: strategies for effective human-computer interaction
Designing the user interface: strategies for effective human-computer interaction
Information Processing and Human-Machine Interaction: An Approach to Cognitive Engineering
Information Processing and Human-Machine Interaction: An Approach to Cognitive Engineering
Human Performance Engineering: A Guide for System Designers
Human Performance Engineering: A Guide for System Designers
Building Effective Decision Support Systems
Building Effective Decision Support Systems
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The paper suggests a structured task analysis and design technique which is based on the "levels-stages" model of a user action. The analysis of existing user tasks employs a top-down strategy. The first stage, dictated by the action model, decomposes the tasks into functional subtasks. The second stage decomposes the subtasks into functionally primitive subtasks according to the structure of the object. At the third stage, the functionally primitive subtasks are described in terms of operations with the object elements.