Clutter Image Rating Scale
This document is used by many professionals around the world. It represents the severity of the problem within the home which affects 2-6% of the UK population.
The ratings are via The International OCD Foundation and were originally from a study by Frost RO, Steketee G, Tolin DF, Renaud S. Development and validation of the Clutter Image Rating. Journal of Psychopathology and Behavioral Assessment. 2008;32:401–417