What is defined as a high-level document outlining the testing approach?

The high-level document that outlines the overall testing approach is known as the Test Strategy. This document serves as a foundational guideline for the testing processes within a project, detailing the objectives, testing scope, resources, testing techniques, and the intended outcomes of the testing activities. It provides a broad overview of how testing will be conducted across different areas such as functionality, performance, security, etc., and can inform multiple Test Plans.

The distinction between a Test Strategy and a Test Plan is significant. While a Test Strategy provides the overarching approach, a Test Plan is more detailed, outlining specific actions, resources, schedules, and deliverables for a particular testing iteration or phase. Furthermore, a Test Case defines individual test scenarios that are derived from requirements to validate user stories or functional specifications, and a Test Summary Report provides insights about the testing process after execution, including results and overall assessment of quality. Thus, identifying the Test Strategy as the correct answer illustrates an understanding of the hierarchy and specific purposes of various testing documents in the software testing lifecycle.