H

Harness: A test environment comprised to stubs and drivers needed to conduct a test.

Heuristics: The informal, judgement knowledge of an application area that constitutes the "rules of good judgement" in the field. Heuristics also encompass the knowledge of how to solve problems efficiently and effectively, how to plan steps in solving a complex problem, how to improve performance, etc.

High Order Tests: High-Order testing checks that the software meets customer requirements and that the software, along with other systems elements, meets the functional, behavioral, and performance requirements. It uses Black-Box techniques and requires an outsider perspective. Therefore, organizations often use an Independent Testing Group (ITG) or the users themselves to perform high-order testing.

High-order testing includes Validation Testing, System Testing (focusing on aspects such as reliability, security, stress, usability, and performance), and Acceptance Testing (includes alpha and beta testing). The testing strategy specifies the type of high-order testing that the project requires. This depends on the aspects that are important in a particular system from the user perspective.