Control Task Categories

Error probabilities that are used in decomposition approaches are all derived in basically the same manner. Some explicit or implicit form of task classification is used to derive categories of tasks in the domain addressed by the technique. For example, typical THERP categories are selections of switches from control panels, walk-around inspections, responding to alarms and operating valves. 

Case 2—Large continuous operation facility with less automation and a greater reliance upon administrative controls. The focus upon mechanical integrity remains however, there is a stronger emphasis upon personnel reliably carrying out the manual tasks involved with the operations. Example metrics categories often include ... 

This section presents a summary of recommended practices for each substance. These recommendations supplement general work practices (e.g., no eating, drinking, or smoking where chemicals are used) and should be followed if additional controls are needed after using all feasible process, equipment, and task controls. Table 2 (page xviii) explains the codes used. Each category is described as follows ... 

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