When analysing issues related to PEFA indicators I create my personal checklist of issues to consider before moving to score.
My checklist on some issues related to PI-12 - Multi-year perspective in fiscal planning, expenditures policy and budgeting
On the dimension (i) I first ensure that the multi-year forecast of expenditures is real. I have seen several cases in which the three-year forecasting was a simple mathematical projection across the majoirty of sectors. if this is the case I would score that dimension as D.
On the dimension (iiii) the key is that costing of sector strategies are consistent with aggregate fiscal forecasts (as said in the PEFA Blu Book). That may be difficult to assess but a quick way of verification is to go to a strategy document and check at the end. Normally in annex there are financial tables that project the costs of the strategy. If there is no such annex and no consolidated figures are presented in the excutive summary, then you can be pretty sured that the strategy is not properply costed, despite the odd numbers peppered in the text.
On the dimension (iv) I check which procedures, if any, are in place for the selection of new investment prior to their inclusion in the budget. This is called PIM, Public Investment Management that is an important evolution of the PIP, Public Investment Program, based on the old practie of dual budgeting, one for 'development', the other for recurrent expenditures. The insitutioinal set-up for managing public investment is also important. The fact that there ar two departments one for budget and one for investment in the same ministry is not always a guarantee that there is an harmonized process.