QOF indicators can change every year, and new measures and indicators are either introduced or retired. The QOF is not about performance management but resourcing and then rewarding best practice. QOF is part of the General Medical Services (GMS) contract for general practice and was introduced on 1 April 2004.
The most recent business rules are available above in zip folders. Earlier versions (before QOF v28.0) can be found on the Primary Care Commissioning website.