Which of the following best describes the purpose of test case design?

The purpose of test case design is best captured by the idea of creating scenarios that validate software behavior. This involves developing specific test cases that help ensure the software meets its defined requirements and functions as intended in various situations. By focusing on scenarios, testers can systematically explore different aspects of the application, checking not only that it behaves correctly under normal conditions but also how it responds to edge cases or unexpected inputs.

In practice, this method allows for comprehensive coverage, facilitating the identification of defects and issues early in the development cycle. Test case design serves as a key element in ensuring that the final product aligns with user expectations and business goals, thereby enhancing overall quality.

Other options do not align with the primary goal of test case design. Documenting user requirements falls more under the realms of requirements gathering and management. Evaluating testing tools pertains to selecting and assessing software that can aid in the testing process rather than designing test cases themselves. Assessing project budgets relates to project management and financial planning, which is separate from the technical aspect of designing test cases. Thus, the focus on creating scenarios that validate software behavior is what distinctly characterizes effective test case design.