Assessment Tools the NDIS Uses
A plain-English guide to the tools used in NDIS assessments — WHODAS, PEDI-CAT, Vineland and care and needs scales — and how to engage honestly.
During an NDIS assessment, your assessor may use a standardised questionnaire or scale rather than just an open chat. If you have never heard of WHODAS, PEDI-CAT or the Vineland scales, that can feel unsettling. This guide explains, in plain language, what these common tools measure, why they are used, and how to engage with them honestly so the picture they build reflects your real life.
Why standardised tools are used
WHODAS — measuring everyday difficulty
Tools for children — PEDI-CAT and others
Vineland and adaptive behaviour
Care and needs scales and other measures
How to engage honestly with a tool
Frequently asked questions
Do all NDIS assessments use the same tool?
No. The tool used depends on your age, disability and the assessor's approach, and some assessments use no formal tool at all. WHODAS is common for adults, tools like PEDI-CAT are used for children, and the Vineland scales are often used around developmental or intellectual disability. No single…
Is WHODAS a test I can pass or fail?
No. WHODAS is not a pass-or-fail test. It is a questionnaire that describes how much difficulty you have with everyday activities. There is no advantage in appearing more capable than you really are — the most useful answers reflect a typical day, including the help you rely on.
What should I do if a tool's questions do not fit my situation?
Say so. Tell the assessor the question does not match your circumstances and ask them to record your explanation. A score is a summary, and you are entitled to add context so the final picture reflects your real life rather than a number that does not fit.
Who answers the questions in these tools — me or someone else?
It depends on the tool and your situation. Some tools are answered by you, some draw on input from a family member, carer or someone who knows you well, and many combine both. If you are contributing, describe the ordinary reality rather than the best moment you can recall.
Will a low score reduce my funding?
Assessment tools are one input among many, alongside evidence from your treating team and your own description of your life. A single score does not decide your plan on its own. If a result does not reflect your needs, raise it with your planner or LAC and ask that your explanation be considered.
How can I prepare for a tool-based assessment?
Think through a typical day and your hardest days in advance, and note the help you need for each activity so you are not trying to remember everything on the spot. Our guides How to Prepare for an NDIS Assessment and What NDIS Assessors Are Looking For cover this in detail.