We work with Bromcom but our vision for BI is not technology led but outcome led. BI is a powerful tool but in our opinion, we consider the reporting framework the most important. Power BI just happens to complement the framework very nicely.
With anything to do with Data - we are using a framework, it's the ITIL Knowledge Management approach - data to information to knowledge and application of wisdom to make decisions.
So the taxonomy for reporting we are considering (just an example) -
Validation - Validation against a particular strategy (e.g strategy for all schools in MAT to obtain 90% plus attendance). Has this been met after the initiative was introduced?
Direction - Using baseline data to inform decision making and potentially influence a particular course of action (currently 30% of schools within MAT have less than 90% attendance - we need to do something)
Intervention - Corrective and preventative action (Weekly reports on attendance and comparing against actions/initiatives and then allowing further corrective action)
Applying a nested model (Meta - Aggregated MAT, Macro - Aggregated Cluster and Micro- Individual School)
In terms of cost, I would debate that if you get your reporting suite right, it should make life a lot easier and potentially save money due to past inefficient processes/lack of timely information.
The beauty of having a single data warehouse and reporting suite is the accuracy and consistency of data which almost certainly helps with good decision making.