Successful delivery of service improvement depends on knowing what is actually happening, and making decisions using evidence (often termed Performance Management or Performance Improvement). All too often decisions are taken based on assumptions or suppositions, and audits measure things that nobody thinks are important.
My rapid assessment process has been used early in a number of service transformation projects, both to motivate and engage staff, and to assess the direction and progress of a project and any changes needed, early enough to make decisions which make a difference. 
many audit and performance tools suffer:
We typically need results in time to make a decision based on those results, and audit and measurement often have such a time delay built in that the decision-point is passed, and to change direction at the point of decision will cause a lot of expensive undoing.
Minney.org has developed processes which we work through with the stakeholders to:
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John Thorp's book "the information paradox" is probably the foundation on which future benefits realisation has been based. Although it is based around IT projects (notoriously, with a 70% "failure" rate), there is much that can be applied to all environments.
The Demos report "measuring social value: the gap between policy and practice" asks a very important question 'is there a standard method of measuring SROI?'.
The answer is: that depends.
When planning a new project, or evaluating whether an existing service has been successful, financial success is often the only thing that gets counted.