requirements document
(2) The term “requirements document” means a document produced in the requirements process that is provided for an acquisition program to guide the subsequent development, production, and testing of the program and that— (A) justifies the need for a materiel approach, or an approach that is a combination of materiel and non-materiel, to satisfy one or more specific capability gaps; (B) details the information necessary to develop an increment of militarily useful, logistically supportable, and technically mature capability, including key performance parameters; or (C) identifies production attributes required for a single increment of a program.