The processes underlying activity planning were analyzed. The analysis focused on when activities and the attributes of those activities were planned in relation to each other and to the final activity schedule by using the concept of the activity plan horizon extended to the individual attributes. An Internet-based prompted-recall survey using Global Positioning System data was designed to elicit the planning horizons from the survey respondents. The retrospective reports of activity plan times were compared with prospective accounts of activity planning given by the same respondents in a separate survey. The understanding of the activity-planning process, especially how activities are preplanned and in what order the attributes of the activities are decided, can potentially result in more realistic and theoretically sound models of the activity-planning process.
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