Weiss Functional Impairment Rating Scale — Self-Report (WFIRS-S)
Measures how ADHD symptoms affect daily functioning across 7 life domains.
Last reviewed: July 2026
- Full name
- Weiss Functional Impairment Rating Scale — Self-Report (WFIRS-S)
- Measures
- The WFIRS-S was developed by Margaret Weiss to measure functional impairment specifically associated with ADHD.
- Format
- 69 items · ~15 min · Self-report
- Score range
- 0.00 to 3.00 (mean per item)
- Reliability
- Internal consistency: Cronbach's α = 0.95 (total), 0.80–0.93 (domains).
- Population
- Adults and adolescents aged 16+.
- Interpretation
- Domain mean 1.50 or aboveImpairment indicated in that domain
- Two or more items rated 2 within one domainImpairment indicated in that domain
- Any single item rated 3Impairment indicated in that domain
- Total (mean of all 69 items)No published cut-off
Scoring & Interpretation
Each item scored 0 (Never) to 3 (Very Often). Domain scores are mean of non-missing items within that domain. Total score is mean of all items. Higher scores = greater impairment. Items endorsed as 2 or 3 are considered "clinically impaired" for that area.
| Score Range | Severity | Clinical Action |
|---|---|---|
| Domain mean 1.50 or above | Impairment indicated in that domain | Read the domain, not the total — each of the seven is scored and interpreted on its own |
| Two or more items rated 2 within one domain | Impairment indicated in that domain | Weiss treats a cluster of "often" responses in one area as the same signal as a single severe one |
| Any single item rated 3 | Impairment indicated in that domain | A "very often" on one item is enough on its own — check which domain it sits in |
| Total (mean of all 69 items) | No published cut-off | Weiss publishes no total-score band. The total is useful for tracking change over time, not for classifying severity |
- Internal consistency: Cronbach's α = 0.95 (total), 0.80–0.93 (domains).
- Test-retest reliability: ICC = 0.85.
- Discriminates ADHD from healthy controls (d = 1.3–1.8 across domains).
- Sensitive to treatment change in medication trials (Weiss et al., 2018).
- Validated in 12 countries.
ClientForms publishes a standing audit of scoring and interpretation cut-offs across the whole catalogue: scoring accuracy audit.
When to Use This vs Alternatives
| Instrument | Measures | Items | Reach for it when |
|---|---|---|---|
| WFIRS-S This page | ADHD | 69 | The comprehensive option you are reading about |
| ASRS | ADHD symptom frequency (screen) | 6–18 | You need to screen for ADHD symptoms (frequency), not measure impairment. The ASRS asks "how often do you have trouble concentrating?" — the WFIRS-S asks "how much does poor concentration affect your work, relationships, and daily life." |
| ADHD-FIS | Functional impact (screening) | 18 | You want a brief screening snapshot of functional impact (the ADHD-FIS, an original 18-item checklist) rather than the WFIRS-S's comprehensive, validated 7-domain profile. Use the WFIRS-S when you need a validated impairment measure. |
| ACOS | Overall symptom severity | 15 | You want to track overall ADHD symptom severity as an outcome over time rather than functional impairment. The ACOS gives a brief symptom-and-impact total; the WFIRS-S maps impairment across seven life domains. |
ADHD · 69 items
ADHD symptom frequency (screen) · 6–18 items
You need to screen for ADHD symptoms (frequency), not measure impairment. The ASRS asks "how often do you have trouble concentrating?" — the WFIRS-S asks "how much does poor concentration affect your work, relationships, and daily life."
Functional impact (screening) · 18 items
You want a brief screening snapshot of functional impact (the ADHD-FIS, an original 18-item checklist) rather than the WFIRS-S's comprehensive, validated 7-domain profile. Use the WFIRS-S when you need a validated impairment measure.
Overall symptom severity · 15 items
You want to track overall ADHD symptom severity as an outcome over time rather than functional impairment. The ACOS gives a brief symptom-and-impact total; the WFIRS-S maps impairment across seven life domains.
See It in Action
Sample: a completed WFIRS-S, scored and interpreted.
Reassessed after a course of care: was 2.05, now 1.55 (lower than the earlier score).
By domain
- Family
- 11/24
- Work
- 21/30
- School
- 10/30
- Life Skills
- 20/36
- Self-Concept
- 11/15
- Social
- 14/27
- Risk
- 20/45
On ClientForms the total, its band and every domain flag are scored for you and ready to read or export as a PDF.
See the dashboard view
Synthetic sample for illustration — not a real patient.
What It Measures
Unlike symptom scales (which ask "how often"), the WFIRS-S asks "how much does this affect your life. " It covers 7 domains: Family, Work, School, Life Skills, Self-Concept, Social, and Risk-Taking. This makes it essential for demonstrating that ADHD symptoms cause clinically significant impairment — a DSM-5 diagnostic requirement.
- Family
- Relationships and responsibilities at home, with a partner, children and wider family.
- Work
- Performance, attendance and relationships in paid work.
- School
- Learning, study and performance in education or training.
- Life Skills
- Everyday self-management: sleep, money, health habits and getting things done.
- Self-Concept
- How the person sees themselves, their confidence and self-worth.
- Social
- Friendships, social activities and getting along with others.
- Risk-Taking
- Risk-taking and its consequences, including driving, substances and impulsive decisions.
When to Use the WFIRS-S
Use the WFIRS-S after confirming ADHD symptoms are present (e. g., via ASRS screen). DSM-5 requires evidence of functional impairment for diagnosis. The WFIRS-S provides this evidence across multiple life domains. Also useful for treatment monitoring — track whether medication or therapy reduces real-world impact over time.
Who It's For
Adults and adolescents aged 16+. Self-report. Validated in clinical ADHD populations and community samples. Available in 18 languages. For children under 16, use the parent-report version (WFIRS-P).
Frequently Asked Questions
What does the WFIRS-S measure?
The WFIRS-S measures functional impairment caused by ADHD symptoms across 7 life domains: Family, Work, School, Life Skills, Self-Concept, Social, and Risk-Taking. It answers "how much does ADHD affect your daily life" rather than just measuring symptom frequency.
How do you score the WFIRS-S?
Each of the 69 items is rated 0 (never) to 3 (very often). Domain scores are the mean of the items in that domain and the total is the mean of all items, so scores range from 0 to 3. Items a patient rates 2 or 3 mark areas of clinically significant impairment.
What is a clinically significant WFIRS-S score?
Impairment is read per domain, not from the overall mean. A domain counts as impaired when its mean reaches 1.5, when two or more of its items are rated 2, or when any single item is rated 3. The WFIRS-S documents the functional impairment DSM-5 requires for an ADHD diagnosis, which the psychologist interprets in context.
What is the WFIRS-S cut-off score?
There is no published cut-off on the WFIRS-S total, and no total-score severity bands. The published rule applies to each of the seven domains separately: a domain mean of 1.5 or above, two or more items in that domain rated 2, or any single item rated 3. The total is worth tracking across reviews, but it does not classify severity.
Why use the WFIRS-S alongside the ASRS?
DSM-5 requires both symptoms AND functional impairment for ADHD diagnosis. The ASRS confirms symptoms are present; the WFIRS-S documents that those symptoms cause real-world problems. Together they provide the full diagnostic picture.
Where can I get the WFIRS-S, and is it free to use?
Copyright in the WFIRS-S rests with Dr Margaret Weiss, and the form is distributed by CADDRA in its ADHD assessment toolkit. It is not released under an open licence: the form asks that you contact Dr Weiss about posting it online, research use, or translation. On ClientForms you can send it to a patient, who completes it on their phone, and the seven domain scores come back scored for you, ready to read or export.
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