The motives of the activity system are the guiding purposes of the activity, what might be more commonly understood as objectives or goals. Because motives refer to the driving force behind the activity, I will use the phrase "official motives" to describe the formal motives, as described in disciplinary and programmatic literature. Since formal, "official" motives are not, however, what drives some individuals within the activity system, I will use the phrase "unofficial motives" to refer to the motives of individuals when they do not reflect official motives. As motives vary, objects vary.