The Questionnaire on Attitudes Consistent with Sexual Offending (QACSO) is an assessment developed by Lindsay, Whitefield, Carson, Broxholme and Steptoe (2004). The QACSO was designed to assess cognitive distortions relating to sexual offending in males with intellectual disabilities (ID). Cognitive distortions form part of the offence chain in sexual offending and as such require effective assessment and treatment.. To read the full article, log in using your NHS Athens details. To access full-text: click “Log in/Register” (top right hand side). Click ‘Institutional Login’ then select 'OpenAthens Federation', then ‘NHS England’. Enter your Athens details to view the article.