Davros is right, jakbrown and I shalltry to explain why.
PECS is based on Behaviourism. You dont have to know a great deal about it (I dont) but a key factor is that we all are motivated by reinforcement (ie reward). Some people criticise this saying that it treats people like robots (I used to think so too!) but in fact it does no such thing. We all do continue to do things because of the end result (ie work, suffer through pregnancy, sweat in the gymn, whatever!)
Now, consider a child with s/n. By definiton they will get a lot wrong. Until fairly recently, they were rarely 'backstepped' through a process to where they went wrong. They tended to be corrected and things would just carry on as before.
So what had they learnt? Often nothing.
(An example from my work. I might have various action cards on a table and ask a child 'Show me 'swimming''. He chooses something else, so Isay, 'No,swimming'and guide his hand towards the picture.
Has he learnt from his mistake?Probably not.
Is the exercise motivating and reinforcing (ie offering some sort of reward)? No!
Is it boring and pointless? Yes!!
For some kids (partic. ones with ASD) it probably served no purpose whatsoever.
PECS has really tried to address this problem by prescribing stages that have to be followed very very closely in order for a child (or adult) to
A.)Learn from their mistakes
B.) Be motivated to keep on learning because what they are doing is reinforcing (ie has 'rewards' for them.)
With PECS a child first learns to hand over a picture in exchange for something. It is, Iagree amazing when it happens, but can quickly become a meaningless 'robot' exercise, unless the child then masters the next step, namely discrimination (posh word for looking at a picture and understanding what it means/represents) which is exactly where your child (and many many others!) have problems.
Discrimination is the key to a picture based communication system because once you know what the picture 'means' you can be on your way asking for 'swimming' 'swings' 'drink' 'slide' or whatever is your thing.
Your child is getting the 'wrongpicture and giving it to you.
I imagine you are doing one of two things:
A.)aying 'No X, you want this picture' and directing her to the right picture and helping her give it to you.
B.) Taking the 'wrong' picture and giving her what you know she wants anyway.
So, what has she learned? Not what you want her to (pic. discrimination)She has learned something along the lines of
'I just sort of reach out for a picture, there may be a bit of fumbling and swapping that Idon't really understand, but eventually Mummy will give me what Iwant.'
Not great is it?!
PECS recognizes this common problen by building in a stage where the child is presented with 2 pictures-one of something she loves (eg 'bubbles') and one of something of no interst to her (eg 'sock')
The child is encouraged to choose one and, now this is the crucial bit.....
SHE GETS WHAT SHE ASKS FOR!!!!!!!
(Whether that is the sock or the bubbles.)
There are precise steps to run through when the child makes the 'wrong' choice which will in 99% of cases, help her to understand that she has to learn how to discriminate to get what she wants.
With your system (the one that most of us,including me used until PECS came along) it is highly unlikely that she will learn to discriminate. She'ljust become bored and frustrated (as will you) because she doesn't really know what you want her to learn and is not being properly reinforced (rewarded) to learn it.
The fabulous thing about PECS is that if you folow it to the letter, you can't really go wrong, but to understand what to do and why, you must, must, must go on a 2 day training course
(costs about £160. Contact them to find out where the next one nearest to you is being held. Company is called 'Pyramid')
In my job, we fought for the NHS or Social Services to pay for parents to attend PECS courses in order for them to be able to have much more understanding of and power over their children's therapy instead of having to rely on infrequent clinic appointments and vague advice, which especially for children with ASD is, IMO just not good enough.
I suggest you ask for funding for you to attend (even if you can afford it, it is a matter of principle.)
The 2 day course is fascinating and not overwhelming. They are attended by a real mix-parents, health professionals, teaching staff,extended family and so on.
I really dont think you can use PECS properly without being on the course.
BTW Ido not work for PECS or have any financial interests in it. I simply know from my own experince that it is a superbly thought out communication system which has allowed children whom if Iam honest I had almost given up on, to become effective communicators.
I could go on and on forever about this (I am such a PECS bore!!!) but I hope that Ihave answered your question. Please, go on a PECS course. It may well be one of the best things you ever do for your child.
Best of luck!!