The Weiss Functional Impairment Rating Scale
Short answer
The Weiss Functional Impairment Rating Scale (WFIRS), developed by Margaret D. Weiss and shared by the Canadian ADHD Resource Alliance, measures how emotional or behavioral problems affect daily functioning rather than counting symptoms. It has a self-report and a parent form. Clinicians use it to see which life areas are affected and to track change.
Symptoms and impairment sound like the same thing, but they are not. A symptom is what you notice, such as losing focus. Impairment is what it costs you, such as a missed deadline or an argument at home. The WFIRS was built around the second idea.
The idea behind it
Forms and life areas
| Form | Who completes it | Life areas (domains) |
|---|---|---|
| WFIRS-S | The person themselves | Family, Work, School, Life Skills, Self-Concept, Social, Risk |
| WFIRS-P | A parent, about their child | Family, School, Life Skills, Child's Self-Concept, Social Activities, Risky Activities |
The review notes that the two forms are not exact mirrors of each other, although many items overlap. Respondents rate how emotional or behavioral problems have affected each area over the past month, and an item can be marked as not applicable. We do not reproduce any of the items here.
Where it came from and who offers it
Free to print does not mean it is meant for self-diagnosis. The WFIRS is offered to support clinicians, and its value comes from talking through the results. A high rating in one area tells you where things are hard; it does not say why.
How clinicians use it
- During assessment, to see at a glance which areas of life are most affected.
- When planning support, to focus on the areas that matter most to the person.
- Over time, to check whether daily functioning is changing, not just symptoms.
- In research, as an outcome measure alongside symptom scales.
Frequency versus consequences
The ASRS v1.1 screener we offer asks how often certain experiences happened over the past six months. It is about frequency of symptoms. The WFIRS asks about consequences across family, work, school and other areas, and its items refer to emotional or behavioral problems in general rather than to ADHD symptoms. One looks at what happens; the other looks at what it affects. A clinician may use both, and neither is a diagnosis.
If you are getting ready for an appointment, thinking in WFIRS terms can help even without the form. Clinicians often want to know not just that you are distracted but what that distraction has cost. A short list of recent, specific consequences, such as a late bill, a tense week at home or a missed class, gives them something concrete to work with.
If a clinician does give you the WFIRS, answer about the past month as the form asks, even if it was an unusually good or bad month. You can mention anything unusual separately, and that context helps them read the ratings fairly
- Which area of my life feels most affected right now: family, work or school, daily tasks, how I see myself, friendships, or risk-taking?
- What is one concrete thing that went wrong in that area in the past month?
- Is anything else going on, like stress, grief or poor sleep, that could be part of it?
A starting point for your next step.
Curious about the symptom side? The free six-question ASRS v1.1 screener asks about the past six months and gives the official outcome.Frequently asked questions
Is the WFIRS an ADHD test?
No. It measures how problems affect daily functioning across life areas. It was developed for ADHD care but does not identify ADHD, and the developers note it is now used with other conditions too.
Is the WFIRS free?
CADDRA lists the self and parent forms among its free, printable questionnaires for clinicians. Interpreting the results is still a job for a professional who knows your history.
What is the difference between symptoms and impairment?
Symptoms are the experiences themselves, like trouble focusing. Impairment is their effect on real life, such as problems at work or at home. The WFIRS focuses on impairment.
Sources
Source check: 2026-10-28. No medical review has occurred.
- Weiss MD, McBride NM, Craig S, Jensen P. Conceptual review of measuring functional impairment: findings from the Weiss Functional Impairment Rating Scale. Evidence-Based Mental Health. 2018;21(4):155-164.
- Canadian ADHD Resource Alliance (CADDRA), "ADHD Questionnaires" eToolkit page
- National Institute of Mental Health, "ADHD in Adults: 4 Things to Know"
Published 2026-10-28. Factual source check: ADHDFalcon editorial team, factual source check, 2026-10-28. No medical review has occurred.