The Strengths and Difficulties Questionnaire (SDQ) is a brief emotional and behavioural screening questionnaire for children and young people. The tool can capture the perspective of children and young people, their parents and teachers.  

The SDQ scales include:

1) Emotional symptoms subscale
2) Conduct problems subscale
3) Hyperactivity/inattention subscale
4) Peer relationships problem subscale
5) Prosocial behaviour subscale

The SDQ can be used for various purposes, including clinical assessment, evaluation of outcomes, research and screening.