This set of slides is put together by Alison Laver-Fawcett and provides an overview of information in relation to PROMS - Patient Reported Outcome Measures
Another set of slides that provides an overview of the value of outcome measures. Conclusion is that there is no single must use outcome measure - recommends using more than one.
This presentation was given at the South African conference in July this year (2012) - I happened to be there. Daleen Casteleijn has just completed her PhD on this topic.
This is an overview of a lot of information. For those looking at COPM & GAS - there are helpful comments. This is a good overview and I suggest that you take time to look through the points raised.