; and (2) involves— (A) the incremental development and fielding of capabilities, commonly called spirals , spins , or sprints , which can be measured in a few weeks or months; and (B) continuous participation and collaboration by users, testers, and requirements authorities. 884. Review and realignment of defense business systems to emphasize agile methods (a) In general Not later than 30 days after the date of the enactment of this Act, the Secretary of Defense, in consultation with the Chief Information Officers and Chief Management Officers of the military services, shall conduct a comprehensive assessment of investments in defense business systems and prioritize no fewer than four and up to eight such systems for realignment and restructuring into smaller increments and the incorporation of agile acquisition methods. (b) Program assessment elements The assessment under subsection (a) shall include the following: (1) A comparison of investments in business systems across the Department of Defense within each business system portfolio category, such as personnel and pay systems, accounting and financial systems, and contracting and procurement systems. (2) Identification of opportunities to rationalize requirements across investments within a business system portfolio. (3) Identification of programs within business system portfolio categories that are most closely following the best acquisition practices for software intensive systems. (c) Program realignment selection criteria In identifying programs for potential realignment, the Secretary of Defense shall prioritize programs that— (1) did not deliver any operational capability within the prior calendar year; (2) have experienced cost growth and schedule delay