Hi sorry I was in a rush to post this am from the phone so couldn't really explain.
The things that need to be looked at ?
? What the child attempted to produce (independent analysis of adult form)
? What the child actually produced (independent analysis of child form)
? What was produced correctly (relational analysis)
? What was produced incorrectly (relational analysis)
? The nature of errors (e.g. if they represent typical or atypical processes in speech development)
? Percentage Consonants Correct
? Connected speech ? looking for errors of prosody (tone) or the ways words work together in sentences (coarticulation)
If using a free sample (e.g. just sampling in play), at least 200 words should be included. Otherwise, the DEAP or similar should be used.
Any assessment should include a range of syllable types e.g.
? cv ? boo
? cvcv ? booboo, baba, mama, nana (same consonant, same vowel) ? then same consonant, different vowel e.g. bobby, then different consonant, different vowel e.g. digger
? cvc ? cat, man etc
? ccvc ? spin and cvcc pits etc
? Then multisyllabics
It may be a good idea to look at ddk rates (diadokinetic - not sure how to spell) which basically looks at rapid sequencing of sounds in words e.g. d/k/d/k
It's also important to do a stimulability test - this looks at the sounds that your child isn't making in their speech. Essentially, different techniques are used to check if your child can make these sounds e.g. on their own /k/, in a vowel frame /aka/ in a cv or vc structure e.g. eek or boo (some sounds are easier to produce with certain vowels etc).
That's not all though! An assessment should also look at how your child perceives sounds - can they tell they are making the errors they are making e.g. if they say dak for cat, can they let you know if you point to a picture of a cat and say dak that this is not the expected form. There are a variety of tasks that tap into this and there are different ways of training kids to accurately perceive sounds in words.
Phonological awareness skills should also be assessed - there are a variety of assessments for this but I can't think off the top of my head what the best for a child of your son's age is.
It may be a good idea to look at ddk rates (diadokinetic - not sure how to spell) which basically looks at rapid sequencing of sounds in words e.g. d/k/d/k
In terms of getting them to do it ? just tell them that your understanding of EBP for child speech disorders is that all of the above are required. Ask what they are going to do about it. If there are any issues, I can get you evidence ? I'd also recommend you access the phonologicaltherapy list on yahoo. It?s not a site for parents but if you join and search for evidence for apraxia/dyspraxia/child speech disorders/phonological impairment (another name for a type of speech disorder) etc, you will find lots. They don?t tend to like questions from ?consumers? but a valuable resource nonetheless - all of the major big bods in speech disorders nationally post ?and argue fiercely?on it.