An assessment session will typically last between 30 minutes and an hour.  A speech and language therapist (SLT) will usually start by talking to you about your child’s early history and development and gathering some information about your concerns. The assessment they do will look at how well your child’s speech and language are developing compared to what we would be expected for a child of their age.

Depending on the age of your child and the type of difficulty that they have they will do a number of different tasks and activities.  For some children, particularly younger ones, the assessment may be done through the SLT playing alongside your child, or watching them play.  This is known as ‘informal’ assessment.  They will be looking at the way your child understands language, how well they are talking and which sounds they are able to use in their speech.

Sometimes an SLT will carry out a ‘formal’ assessment.  This means they work with your child using a number of published assessments, many of which are standardised.  Standardised tests mean that they are able to give your child a score comparing them to other children of the same age.  Doing this lets them see if a child is developing as they should be, or if their speech and language is delayed.

The video below will show you how a Developmental Language Disorder (previously known as an SLI) is assessed:

The speech and language therapist will then tell you how they think your child is doing, and whether they feel your child needs to get some extra help with their speech and language development.  They will usually write a report about the assessment.


My child was assessed by speech and language therapy and I have been given a report.  I am not sure what some of the numbers on the report mean.  Can you explain what scaled scores and percentile ranks are?

These scores are ways of turning the number of answers a child has got right into a ‘standardised’ score.  This is a way for the score to be compared to other children of the same age.

The average scaled score is 10 and the typical range is 7-13.  This means that if your child has got a score between 7 and 13 then their language skills are what we would expect for their age.  If they got a score below 7, then their language skills are delayed.

The typical range for percentile scores is 15-85, with the average being 50.  So, if your child has got a score lower than 15 then they will be considered to have delayed language skills.

If you are struggling to understand your child’s report, you can get in touch with your speech and language therapist.  They will be able to talk you through the report and what it means for your child.


My child has been referred for a multi-disciplinary assessment.  I know that he will see a speech and language therapist but I don’t know who else will work with him.  Can you help?

A multi-disciplinary assessment means that more than one professional will assess your son, and they will talk to the other people involved to help them work out where his main difficulties are.

Usually a multi disciplinary assessment will involve a paediatrician, as well as a speech and language therapist.  Sometimes there will also be a psychologist, physiotherapist, occupational therapist or other professional, depending on the clinic and the way that services are set up locally.