Task inventories and checklists are questionnaires that are used to collect information about a particular type of work. An analyst completes a list of tasks or job activities, either by checking or rating each item as it relates to the work in question, in terms of the importance of the item, frequency with which the task is performed, judged difficulty, time to learn, or relationship to overall performance. Although these data are adaptable for computer analysis, checklists tend to ignore the sequencing of tasks or their relationships to other jobs. Thus, an overall perspective is extremely difficult to obtain with checklist information alone. However, if one purpose of a task inventory is to assess the relative importance of each task, then a unit-weighted, additive composite of ratings of task criticality, difficulty of learning the task, and relative time spent may provide the best prediction of average task importance across SMEs (Sanchez & Fraser, 1992).