The demand model is based on the assumption that trip purposes or external activities cause mobility (Fundamentals: Transport demand model).
An activity pair corresponds to the trip between two successive activities in the daily routine of a person.
An activity chain describes a sequence of typified activities in the daily routine of a person. For example, the chain home – work – shopping – home (HWOH). Such a sequence of activity pairs implies trips, in this example here three different trips: HW, WO, OH (Fundamentals: Activities, activity pairs, activity chains).
