Of the various obsessive-compulsive phenomena it seems that compulsive
checking may be particularly likely to repay an information-processin
g approach. There are indications that anxiety-targeted exposure metho
ds are less appropriate to checking than cleaning. Also, repeated chec
king appears to result from an initial failure to process information
adequately. Recent findings from experimental research on cognitive pr
ocesses in obsessive-compulsive patients (e.g. difficulties in selecti
ve-set rather than filtering tasks, poor memory for actions, etc.) pro
vide indications that compulsive checking may arise from a failure of
information processing. Clinical observations indicate that the qualit
y of information processing involved in checking deteriorates as check
ing is repeated, due partly to a deterioration of mood and partly to p
roactive interference. This suggests the use of cognitive strategies t
o maximize the effectiveness of the first check, so as to reduce the n
eed for repetition.