The Swanson, Nolan, and Pelham-IV Rating Scale (SNAP-IV-26) is a widely used, standardized measure designed to evaluate the presence and severity of…
Questions
26
Duration
10 min
Original title
SNAP-IV-26 — Swanson, Nolan, and Pelham-IV Rating Scale
Adaptation
SNAP-IV 26-Item Teacher and Parent Rating Scale
Authors
Swanson, J.M., Nolan, W., & Pelham, W.E.
Created
1992
The Swanson, Nolan, and Pelham-IV Rating Scale (SNAP-IV-26) is a widely used, standardized measure designed to evaluate the presence and severity of symptoms associated with Attention-Deficit/Hyperactivity Disorder (ADHD) and Oppositional Defiant Disorder (ODD) in children and adolescents. Completed by a parent, caregiver, or teacher, it offers clinicians a structured, multi-informant window into the young person's daily functioning across different environments. By mapping directly onto core diagnostic criteria, the SNAP-IV provides an essential framework for quantifying behavioral regulation and attention difficulties, much like how ADHD management tips help structure therapeutic interventions.
In clinical practice, the 26-item version is highly valued for its efficiency and focused clinical utility. It is not a standalone diagnostic test, but a robust clinical tool that establishes a baseline and tracks changes over the course of treatment. Gathering data from both home and school environments allows clinicians to observe situational variations in symptoms, supporting a more nuanced, ecologically valid assessment of the child's behavioral profile before introducing ADHD parenting strategies.
Example result
Fictitious result, computed from a sample set of answers.
A 26-item rating scale used to screen for ADHD and oppositional defiant disorder (ODD) in children, and to evaluate symptom severity according to DSM-IV criteria. The symptom domains assessed are Inattention (IA, items 1-9), Hyperactivity/Impulsivity (HI, items 10-18), and Opposition/Defiance (OD, items 19-26). Informant-report assessment completed by a parent or teacher for a child/adolescent aged 6 to 18 years.
Hyperactivity/Impulsivity
13/ 27
The Hyperactivity/Impulsivity subscale (items 10-18) corresponds to the 9 ADHD hyperactivity and impulsivity symptoms as defined in the DSM-IV.
items10, 11, 12, 13, 14, 15, 16, 17, 18
0–12
Symptoms not clinically significant
13–17
Mild symptoms
13
18–22
Moderate symptoms
23–27
Severe symptoms
Scoring guidelines recommended by the Canadian ADHD Resource Alliance (CADDRA) and Canadian Collaborative Mental Health Care Initiative to classify severity.
généralemixed · general population · Parent-rated · 5–11 years · United States · n = 855 · 1998 · Bussing et al. (2008)
027
13
M = 2.9 ± 2.9
cliniquemixed · pathology : general behavioral/emotional concern · Parent-rated · 5–11 years · United States · n = 439 · 1998 · Bussing et al. (2008)
027
13
M = 6.8 ± 5.6
cliniquemixed · pathology : suspected or diagnosed adhd · Parent-rated · 5–11 years · United States · n = 318 · 1998 · Bussing et al. (2008)
027
13
M = 13.1 ± 7.8
cliniquemixed · pathology : adhd diagnosis positive · Parent-rated · 5–11 years · United States · n = 111 · 1998 · Bussing et al. (2008)
The Inattention subscale (items 1-9) corresponds to the 9 ADHD inattention symptoms as defined in the DSM-IV.
items1, 2, 3, 4, 5, 6, 7, 8, 9
0–12
Symptoms not clinically significant
12
13–17
Mild symptoms
18–22
Moderate symptoms
23–27
Severe symptoms
Scoring guidelines recommended by the Canadian ADHD Resource Alliance (CADDRA) and Canadian Collaborative Mental Health Care Initiative to classify severity.
généralemixed · general population · Parent-rated · 5–11 years · United States · n = 855 · 1998 · Bussing et al. (2008)
027
12
M = 2.2 ± 2.7
cliniquemixed · pathology : general behavioral/emotional concern · Parent-rated · 5–11 years · United States · n = 439 · 1998 · Bussing et al. (2008)
027
12
M = 6.7 ± 5.8
cliniquemixed · pathology : suspected or diagnosed adhd · Parent-rated · 5–11 years · United States · n = 318 · 1998 · Bussing et al. (2008)
027
12
M = 14.1 ± 7.9
cliniquemixed · pathology : adhd diagnosis positive · Parent-rated · 5–11 years · United States · n = 137 · 1998 · Bussing et al. (2008)
027
12
M = 16.6 ± 6.9
ⓘFor information
Cut-off≥ 16ADHD screening cutoff (inattention)
Inattention: "≥16" cutoff with "0.792" sensitivity and "0.811" specificity (Table 4, raw sum, parents).
The SNAP-IV-26 measures three primary behavioral dimensions aligned with core diagnostic criteria for ADHD and Oppositional Defiant Disorder (ODD). It systematically captures the frequency of specific difficulties as observed by key adults in the child's life, helping tailor coping strategies for children and adolescents.
Inattention: Difficulties sustaining focus, organizing tasks, following instructions, and managing daily routines without losing things or becoming distracted.
Hyperactivity and Impulsivity: Physical restlessness, difficulty remaining seated or playing quietly, excessive talking, and struggles with waiting or interrupting others.
Opposition and Defiance: Tendencies toward anger, arguing with adults, actively refusing rules, deliberately annoying others, and vindictive behaviors.
This instrument is intended for children and adolescents, typically between the ages of 6 and 18, and relies on the observational report of parents, caregivers, or teachers.
When and why to use it
Clinicians integrate the SNAP-IV-26 at various stages of the clinical journey to support comprehensive evaluation and evidence-based care.
Intake and baseline assessment: To establish a structured, quantitative profile of ADHD and ODD symptoms before initiating targeted interventions or building new habits.
Cross-context screening: To compare behavioral reports between parents and teachers, highlighting whether symptoms are pervasive across settings or context-dependent.
Monitoring treatment response: To track shifts in symptom severity over time, offering objective data to evaluate the efficacy of pharmacological therapies or behavioral interventions like study tips for ADHD and test anxiety.
Differential support: To distinguish between pure attentional struggles and co-occurring oppositional behaviors, guiding more tailored family and school accommodations.
Using a validated measure like the SNAP-IV-26 anchors clinical impressions with standardized data, ensuring that subtle behavioral changes are reliably captured rather than relying solely on subjective observation.
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