The thesis is developed that therapy and research are not necessarily the same activity and that clinicians are not necessarily researchers. Though there are commonalities between research and therapy, especially as the use of single-subject research designs has increased, using the scientific method to guide therapy is not the same as doing science. The requirements of good therapy and good research are often different in critical ways. Both research and therapy are important to the vitality of the profession, and the profession is strengthened when the differences are acknowledged.