The style of planning action (STOP) questionnaire in OCD spectrum disorders

• A questionnaire measuring the style of planning was validated on the OCD spectrum.
• Three factors emerged: overcomplication, overpreparation and overactivity.
• Two of the three subscales showed good internal consistency.
• All subscales showed clinical relevance and changed following CBT.

This article describes the exploratory and confirmatory validation of an everyday style of planning (STOP) questionnaire in a tic disorder (n = 88), Tourette syndrome (n = 76), body-focused repetitive behaviour group (n = 121), obsessive compulsive disorder (n = 251) and a non-clinical control group (n = 127).Exploratory factor analysis was performed on half of the sample and confirmatory analysis on the other half. A three factor solution accounted for 38% of the variance. The factors were labelled respectively: overcomplication, overpreparation, and overactivity. The internal consistency for the overcomplication score and total score was high and for the other two scales, satisfactory. Test–retest was satisfactory and the subscales discriminated amongst clinical groups, and clinical groups from controls. All subscales became significantly less pathological following cognitive behavioural treatment. Convergent validity showed strong correlations with depression, anxiety and perfectionism but not impulsivity. The study confirms style of action as an important characteristic of obsessive compulsive spectrum disorders. Further analysis of the structure of each factor is warranted.