Executives that are new to the wonders of business intelligence products often wonder why their current IT systems and staff can't perform the same functions as those offered by BI vendors. The answer is simply that the diversity of data repository formats and standards require substantial development in order for current technology to be applied in a performance management setting.
Adapting legacy systems to be able to access all of the vast repositories found in today's enterprises would require “reinventing the wheel." Additionally, the required development effort, if attempted, would be far beyond the capability of even the most capable of IT departments. Cobbling together that magnitude a system in order to achieve a small level of performance management is simply too complex an undertaking and would not make economic sense.
The key to BI success lies in the ability for the executive/manager to link into the data through advanced query and reporting tools like dashboards and scorecards. These capabilities, with a scope beyond the norm, generate the impetus for the use of BI product modules for budgeting software that lead to enhanced decision-making.