What we see in the U.K. is that, as it did with public-private sector partnerships, it set up a template. It set up a central agency that provides a template for the service agreements, and that would help smaller institutions in terms of legal fees and so on, but also it would ensure some comparability across the model and would help in the assessment of the model.
They have also recently set up a centralized database on unit costs in different areas in which SIBs are being implemented, so unit cost information on crime, education, skills, employment, fire, health, etc. The idea there is to avoid having to customize each project. You draw on this centralized data and make sure that it's consistent across projects.
At one level, as Jamie was saying, there has to be a certain level of customizing, simply because each situation may be slightly different, but obviously the U.K. approach is to standardize as much as possible.