The SNAP-IV (Swanson, Nolan, and Pelham Rating Scale – Fourth Edition) is a behavioural questionnaire used to evaluate symptoms of ADHD (Attention Deficit Hyperactivity Disorder) and Oppositional Defiant Disorder (ODD) in children and adolescents. Developed by Dr. James Swanson, the SNAP-IV is one of the most widely used tools for gathering information from parents, teachers, and caregivers about a child's behaviour in day-to-day settings.

The questionnaire is based on the diagnostic criteria listed in the DSM-5 (Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition) and includes items that assess inattention, hyperactivity/impulsivity, and oppositional behaviour. Respondents are asked to rate the frequency of specific behaviours—such as difficulty sustaining attention, interrupting others, or arguing with adults—on a 4-point scale ranging from “Not at All” to “Very Much”.

The SNAP-IV is particularly useful in both screening and monitoring progress over time. It helps clinicians and educators understand whether a child's behaviours align with ADHD or ODD, and it provides valuable insight into the severity and impact of those symptoms in different environments (e.g., at home or at school).

It’s important to note that the SNAP-IV is not a standalone diagnostic tool. Instead, it is used in combination with clinical interviews, observations, and other assessments to build a more comprehensive picture of the child’s functioning. When interpreted by a trained professional, the results of the SNAP-IV can guide next steps, such as formal diagnosis, treatment planning, educational support, or behaviour management strategies.

Click here to download the resource