 Model audit. The model audit is the colloquial term for the tasks performed when conducting due diligence on a financial model, in order to eliminate spreadsheet error. Model audits are sometimes referred to as model reviews, primarily to avoid confusion with financial audit. The study in 1998 concluded that even MBA students with over 250 hours of spreadsheet development experience had a 24% chance of introducing spreadsheet error. Model audits are typically requested by banking organizations, in order to reassure lenders and investors alike that the calculations and assumptions within the model are correct, and that the results produced by the model can be relied upon. When a comprehensive review of the model is required, the scope of review is often extended to include tax and accounting, sensitivity testing and the checking of data contained within the model back to the original financing and legal documentation.