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The measurement that effectively gauges the impact of a process improvement project on business results is return on investment, or ROI. ROI quantifies the financial benefits of a project relative to its costs, allowing organizations to assess whether the improvements made are yielding sufficient financial returns. By calculating ROI, businesses can determine how much profit is generated for each dollar spent on the improvement initiative, making it a vital metric for evaluating the success of a project in terms of its contribution to the overall financial performance of the organization.

In the context of process improvement, ROI helps stakeholders to make informed decisions about future projects, prioritize initiatives based on their expected financial impact, and secure necessary funding or resources by demonstrating the value of undertaken improvements. It serves as a clear indicator of effectiveness, helping to align process improvements with strategic business objectives.

While the other options, such as DOE (Design of Experiments), CTQ (Critical to Quality), and FMEA (Failure Modes and Effects Analysis), are important tools used within process improvement methodologies, they do not directly measure the financial impact of process changes. Therefore, they do not provide the same level of insight into the business results linked to those improvements as ROI does.