Abstract
In 1984, Jacobson, Follette, and Revenstorf defined
clinically significant change as the extent to which
therapy moves someone outside the range of the
dysfunctional population or within the range of the
functional population. In the present article, ways of
operationalizing this definition are described, and
examples are used to show how clients can be categorized on
the basis of this definition. A reliable change index
(RC) is also proposed to determine whether the magnitude
of change for a given client is statistically reliable. The
inclusion of the RC leads to a twofold criterion for
clinically significant change.
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