A business case is a document that outlines the rationale, objectives, benefits, costs, risks and alternatives of a proposed IT project. A business case should be reviewed periodically throughout the project life cycle to ensure that the project is still aligned with the enterprise's strategy and goals, and that the expected benefits are still achievable and realistic. A periodic review of the business case can also help to identify any changes or issues that may affect the project's scope, schedule, budget or quality, and to take corrective actions accordingly. References: ISACA, CGEIT Review Manual, 7th Edition, 2019, page 77. A guide to measuring benefits effectively. Cost-Benefit Analysis: A Quick Guide with Examples and Templates.