The primary purpose of test and evaluation (T&E) is to support system development and acquisition by serving as a feedback mechanism in the iterative systems engineering process. This pamphlet, Department of the Army Pamphlet DA PAM 73-1 Test and Evaluation in Support of Systems Acquisition July 2024, provides guidance and procedures to implement T&E policy for materiel and information systems with regard to planning, executing, and reporting T&E in support of the acquisition process. Developing and deploying Army systems that are operationally effective, suitable, and survivable represents a significant challenge to all involved in the systems acquisition process.