*Result*: A Case Study-based Assessment of a Model-driven Testing Methodology for Applicability and Metrics of Model Reuse.

*The Department of Defense (DoD) Test and Evaluation (T&E) community has fully embraced digital engineering, as defined in the 2018 Digital Engineering Strategy, motivating the ongoing development and adoption of model-based testing methodologies. The present article expands on existing grey box model-driven test design (MDTD) approaches [1] by leveraging model-based systems engineering (MBSE) artifacts to generate flight test planning models and documents. A baseline model of a system under test (SUT) and two additional system case studies are used to assess a Model-Driven Test Design (MDTD) process. We illustrate the method’s applicability to these case studies, evaluate the benefits of MDTD by applying novel metrics of model element reuse, discuss the benefits of MDTD by applying novel metrics of model element reuse, and discuss the relevance to operational flight testing. This approach is novel within the flight-testing community as it is the first implementation of MDTD in United States Air Force (USAF) operational testing applications. Whereas previous studies have explored SysML model reuse in small-scale problems or product families [2] [3], MBSE model management for operational tests at flight-system scale and assessment of reuse in the T&E phase of the SE lifecycle are unresearched to date. This methodology and the case studies will be of particular interest to those involved in developing, executing, and reporting on flight test plans in the context of the DoD Digital Engineering transformation. [ABSTRACT FROM AUTHOR]*