The model identifies six functions of Departments in relation to PPP and PFI projects and programmes. In turn, each function is broken down into two to three sub-functions, which provide further detail of what we mean by the function. The model assumes Departments manage their complex capital investments programmes utilising private finance through a single unit (the Unit).
For each sub-function we have set out a maturity scale, with three descriptions of practice we identified at Units. These are labelled from * (least mature) to *** (most mature). These are cumulative, rather than mutually exclusive, so the best practice is to undertake the actions identified in all three.
We have also included between two and three case studies for each function. These represent maturity at ** or *** levels. The case studies are taken from our interviews with Departments. Although we have checked our understanding of the case studies against our previous work, we have not audited them. They are provided to illustrate the model and suggest places to turn for inspiration.
At the end of the model, we have set out some enablers, which help Units to achieve effective practices across the six functions.