Abstract
This study examines the interrelationships among the durations of a series of activities pursued by an individual and their dependencies on the time of day, activity location, and activity history. The analysis, which employs a sequential stochastic process model framework, indicates that the past history of activity engagement is the most important factor that influences the activity duration, while the effects of time of day and location are rather limited, and the the inclusion of history variables makes possible an appropriate representation of the interdependencies across the activity durations.