A business case is created to justify a proposed project or change. It outlines the benefits, costs, risks and expected returns to determine if the project is worthwhile. Key aspects of a strong business case include accurately estimating all costs, including implementation costs that are often overlooked; phasing projects to implement in stages and check if further phases are justified; and measuring benefits after launch to confirm the business case was realized. Business cases should be reassessed periodically during a project and used to determine if it should continue or be cancelled if benefits are not materializing or costs increasing substantially.