Although widely utilized within clinical assessment, self-monitoring has re
ceived little direct research attention since the early 1980s. The assessme
nt and treatment functions of self-monitoring are described and illustrated
in this article. As an assessment method, self-monitoring can provide valu
able information for diagnosis, target behavior selection, functional asses
sment, and treatment monitoring. Research findings delineating variables kn
own to influence the accuracy and reactivity associated with self-monitorin
g are reviewed. Some suggestions are made for additional research that migh
t be conducted regarding self-monitoring accuracy, effects on clients, and
utility within treatment.