This article argues that although occupational therapy and rehabilitat
ion are often considered synonymous, the latter is but one aspect of t
he former. Early influences on occupational therapy are briefly review
ed, and some philosophical ideas about activity are described. The rat
ionale for the use of occupations as treatment in the early part of th
is century, both in Canada and in the United States, is examined and c
ontrasted with the development of physical medicine and rehabilitation
after World War II. This discussion demonstrates that the origins of
occupational therapy and rehabilitation in North America had little in
common. As occupational therapy became incorporated into rehabilitati
on, the profession's core values eroded, and although current definiti
ons of rehabilitation offer a more appropriate fit for occupational th
erapy, rehabilitation continues to see engagement in occupations as a
separate and subsequent step. The article concludes by considering fut
ure directions and the tasks that lie ahead.