A user survey is a technique that can be used to determine how well the solution meets the business case. A user survey is a method of collecting feedback from the end users of the solution about their satisfaction, preferences, expectations, needs, problems, or suggestions. A user survey can help to measure the performance, quality, usability, and value of the solution and compare it with the expected benefits and outcomes defined in the business case. A user survey can also help to identify areas for improvement or enhancement of the solution. Asking the sponsor for feedback is not sufficient to determine how well the solution meets the business case, as it does not capture the perspective of the end users who are directly affected by the solution. Surveying the project is not relevant to this scenario, as it does not focus on the solution but rather on the project management processes and practices. Comparing the results of day-in-the-life (DITL) testing and integration testing is not effective, as it does not reflect the actual usage and experience of the solution by the end users after deployment. References: PMI Professional in Business Analysis (PMI-PBA)® Examination Content Outline1, page 14; Business Analysis for Practitioners: A Practice Guide2, page 80.