What document authorizes entry into the next life cycle phase by the milestone decision authority?

The Acquisition Decision Memorandum is the key document that grants authorization for a program to proceed into the next phase of its life cycle, as determined by the milestone decision authority. This memorandum outlines the decisions made during a milestone review, including the approval to enter a specific acquisition phase, and it typically includes directions concerning program objectives, funding, schedule, and specific requirements that must be met.

Entry into the next life cycle phase often requires a formal assessment of performance, cost, and schedule, which is documented in the Acquisition Decision Memorandum. This decision-making process helps ensure that the program aligns with strategic goals and is ready to move forward with sufficient planning and resources in place.

The other options, while relevant to the acquisition process, do not serve the same role. A Functional Needs Analysis is focused on identifying capabilities needed to address gaps but does not authorize life cycle phase transitions. The Acquisition Program Baseline outlines the program's cost, schedule, and performance parameters, but it is not the document that authorizes movement between phases. The Defense Acquisition Guidebook provides guidance on best practices and procedures but does not itself authorize decisions regarding a program's life cycle phase. Thus, the Acquisition Decision Memorandum is the appropriate document for this authorization.