According to the Rose Review (2003, pp 178-9),
'Many UK studies report results not in standard scores but in reading and spelling ages, from which ratio gains can be calculated in order to evaluate the effectiveness of the intervention. A ratio gain of 1.0 means that the child?s skills are developing at a normal pace, but they will not be catching up with their peers. Brooks (2007) suggests that ratio gains of less than 1.4 are of ?doubtful educational significance?, between 1.4 and 2.0 of ?modest impact?, between 2.0 and 3.0 of ?useful impact?, between 3.0 and 4.0 of ?substantial impact? and above 4.0 of ?remarkable impact? (Brooks. 2007, p. 289).
However, Brooks (2007) points out that ordinary teaching (i.e. no intervention) does not enable children with literacy difficulties to catch up, and hence it is fair to presume that, in the absence of control or comparison groups, and where effect sizes cannot be calculated, findings of ratio gains in excess of 2.0 may be taken as good evidence in support of the method employed. Indeed, several studies have shown that, without help, dyslexic pupils progress at around only 5 months per calendar year in reading (ratio gain 0.42) and 3 months in spelling (ratio gain 0.25) (Thomson, 1990, 2001; see also Rack and Walker, 1994).'
If he is not making progress the interventions should be increased (Wave 1 to Wave 2 etc) and he should be put on School Action.
Also you said he had a scribe - why? Has he been assessed by OT?
If your son is not a problem to teaching staff they will not want to 'buy in' an EP - in some schools literally - they no longer have to buy the service from the lea btw but from the cheapest bidder - if the EP will not do anything. I was told by the EP that DS was probably not dyslexic because 'he could read and write' (ie the lea is not interested unless they can't) and that even if he were he would not get any more or any different interventions. This was not true. It is worth paying (around £500) for private EP assessment. Go to someone reputable rather than a dyslexia service that does diagnosis by SpLD teachers rather than EPs and is more interested in flogging their tuition services. Head/SENCO told me days before the diagnosis of dyslexia, dyspraxia and dyscalculia and ADD by an independent EP that in his 20 year experience he could assure us that DS was not dyslexic, that he had taught many dyslexic children blah blah blah - bollocks. The school also 'missed' a severe auditory processing disorder and ASD.
Pay for your own assessments and if DS is dyslexic calculate ratio gain. Use these to get the maximum provision DS is entitled to. Ratio gain is then used to measure how effective the intervention is. Also do other stuff - vision training, retained reflex therapy if needed etc. If RA and SA are age equivalent or rate of progress is adequate you can tick this of and focus upon motor skills, especially fine motor skills. Get GP to refer you to OT. They will send questionnaire to home and school. Waiting lists can be long - many months - and so do this asap rather than waiting for outcome of other assessments.
Sorry to go on so.
