justa, I use ABA with PDA-probable dd2 (well, i would, really, wouldn't I, given our history in it?
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the thing about ABA is that it is not one thing - as Star said earlier, it does whatever you want/need it to do for a particular child in a particular situation (and then works on generalising parts of the "lesson" as appropriate)
Slinky: I am coming late to this (sorry - abroad at the mo).
dd1 is in an ABA school.
to get her there, we had to:
fund our own home programme for 2 years (part time)
move house, put d1 into a TEACCH based ASD pre-school and let her fail for a year (most of that year self funded - cost of £20k or so).
self fund her initially at the ABA school (annual tuition £50k) while we took the LEa to Tribunal, as well as funding legal help to (try to) ensure we won. And then move back across the country to lessen the commute I had taking dd1 to/from school, which had been imposed due to previous move for ASD preschool. I was taking her 40 miles each way to ABA school.
In the end, our LEA settled before Tribunal, but not before considerable cost to us, as you can see. we are now stuck in a county we don't want ot be in, as d1's statement is issued by that county. her school is in the next county (we now live on the border between the counties) - ironically where we first lived. we no longer live in our house, but cannot sell it (thankfully it is rented out) and rent instead, 25 miles away. overall, to get dd1 ino ABA school (she is 6, has been there for just over a year) has easily cost us £100k, if you take into account the home programme, the legal fees, the TEACCH pre-school to prove she owuld fail, and the ABA school fees initially, plus 2 house moves.
as others have said - Early intervention pretty much consists of referrign children left right and centre, but not actually DOING anyhting. lots of bits of paper chase dd1 around, but nobody other than her school actually does anything even approaching useful.
and, although dd1's school is excellent, they have their limitations. they are a very small, new school, and cannot provide much by way of outreach. but the nhs consider it covered by her school.
we are abroad now because we have come to the USA to consult with some people re: dd1 (and dd2 to a certain degree) and to gain some insight into how to handle our home life - we are muddling through well, but it could be smoother. but it is costing us another wodge of cash (which thankfully we can afford). trying to balance dd1's needs vs dd2's needs is tricky, but we get no support at home for this.
Everything useful we have doen has been done privately.