Usability in computer documentation design: conceptual andmethodological considerations

The multidimensional nature of usability (including tradeoffs between dimensions) is described, stressing the linkage of the concept to the effective use of documentation by a particular group of readers in performing a certain set of software-related tasks under realistic environmental constraints. Major issues in the evaluation and design of usability are examined. It is argued that the sampling of realistic tasks and target readers is often very difficult, particularly in a laboratory setting, and that additional emphasis must be placed on using multiple observation periods, standardized measures and materials, and multimethod assessments of usability