Activity Analysis Support System by Causal Relation Check Between Sub-activities

When we encounter problems while performing specific activities, we need to identify the cause of the problem to fix it. An activity is composed of several small activities (sub-activities) and the cause might lie in either one of them. We therefore need to analyze the components of the activity to identify the cause. However, since valid sub-activities are not defined, it is difficult to perform a sufficient analysis of the activity. The objective of this research is to propose a method for analyzing an activity and identifying the problematic sub-activity. To attain this goal, valid sub-activities should be defined. This research proposes an activity model that represents the relations between an activity and its sub-activities. In addition, it constructs an activity analysis system with functions to provide hints for deriving sub-activities and verify the validity of the derived sub-activities.