We've known for some time that a robust methodology to understand the size of these benefits (and where and when they arise) is the key to unlocking spending potential. 

Yet, with so many factors to consider and the complications of multiple public agencies investing in, or benefiting from an initiative, it is never as straightforward as it seems.    

There are already some frameworks in place.  For example, some Whitehall departments have guidance specific to their area of interest.  However, there has not previously been an overarching methodology that considers all of these factors and presents one consistent approach.