Strengths and difficulties questionnaire

Published26th September 2014

The Strengths and Difficulties Questionnaire (SDQ) is a behavioural screening questionnaire about 3-16 year olds. It exists in several versions and languages and focuses on emotional symptoms, conduct problems, hyperactivity/inattention, peer relationship problems and prosocial behaviour. It can be completed by parents/carers, teachers and young people themselves.

The tool has a variety of uses, including to evaluate outcome via administering “before” and “after” an intervention.

The is an extended versions of the SDQ called the impact supplement. This asks whether the respondent thinks the young person has a problem, and if so, enquires further about chronicity, distress, impairment in everyday activities, and burden to others.

Finally, follow up questionnaire is available to support evaluation of intervention.


There are various versions of the questionnaire for teachers/educators or parents/carers of 2-4 year olds and 4-17 year olds and for young people themselves aged 11-17.

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