Well, DD1's is entirely tailored. But then it's a SLD/PMLD school with 5 kids & 3 CA's per teacher. It covers everything; basically it is the differentiation part of an entirely differentiated curriculum (if that makes sense): generic lesson plans with a very wide range of expected outcomes are produced and then the teacher marries these with IEPs to decide how the lesson is taught to move each pupil forwards against their individual targets. At least that's the theory. The difficulty we are having at the moment is that SALT (for instance ) has input to IEP ("communication" is pretty much every child's #1 IEP heading) but not to the lesson plans so they don't always marry up completely and there is no way of making sure that the lesson plans as a set cover everything in all the children's IEPs. In which case it's a great but unused document. And this is when it is working well [hmm}.
The other problem I find is that targets are not SMART in the business jargon sense - which renders the entire exercise a bit pointless imo: if you can't measure progress you can't tell when the IEP targets are pointless/wrong and set new ones. We just bimble along saying "oh, X had lots of fun today and isn't it all super and lovely" which no doubt it is but my child needs to be able to ask for food when she is hungry within my life time, or things will get a bit tricky when I am gone. Are we any further towards that? And if this document isn't measuring her progress, if not to that specific goal then to other things as concrete and useful - what use is it?
The reason I say it is different in mainstream - if you look at the SEN toolkit, it says you should have no more than 3 items to work on in an IEP. So the assumption is that the IEP is only needed to cover these 3 specific points - or less - and the rest of the time the child is fine following along with the rest of the class. So logically ought to be a much tighter document.