In businesses, knowledge of work is represented by a sequence of related work events and management of these relations is very important for users. The paper proposes a method that automatically groups related work events from a user's operation record on a Personal Information Management system (PIM). We assume that the related work events on a PIM are operated consecutively by a user. Our method accumulates the target event and time of the user's operations such as inputs, changes, and references, and picks out all related events based on their recorded operation time. However, reference to events is an act that a user just looks at an event on a calendar view, not involving any operation, so recording which event and what time the user referred to is difficult. In order to record the user's reference behavior exactly, we introduce a balloon help based function for event reference support. We ran a one month trial of our developing prototype and confirmed our method can group related work events with acceptable accuracy.
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