People's behaviour is often influenced by processes of which they are
not aware or that they do not intend. However, behaviour is also, at l
east partially, under intentional control. Most task performance is co
-determined by these two classes of processes. Placing intentional con
trol in opposition to unintentional influences is useful for understan
ding the nature of the two forms of processing. However, opposition al
one cannot provide a pure measure of automatic influences because, as
in most tasks, intentional processes also affect the overall level of
performance. The goal of the process dissociation procedure is to dise
ntangle the effects of these two forms of processing on behaviour. It
approaches this goal by taking advantage of a unique property of inten
tionally controlled processes-their ability to either oppose or act in
concert with automatic processes. The goal of separating the two form
s of processing is imperative for both theoretical and applied purpose
s.