The allocated baseline is, in reality, a composite of a series of allocated baselines. Each allocated baseline consists of the Allocated Configuration Documentation (ACD) which is the current approved performance oriented documentation governing the development of a configuration item (CI), in which each CI specification:
Allocated baseline definition - The current approved performance oriented documentation, for a CI to be developed, which describes the functional and interface characteristics that are allocated from those of the higher level CI and the verification required to demonstrate achievement of those specified characteristics.
Allocated configuration documentation describes the configuration item's functional, performance, interoperability, and interface requirements that are allocated from those of a system or higher level configuration item; interface requirements with interfacing configuration items; and the verifications required to confirm the achievement of those specified requirements.
The establishment of a set of final item-level design requirements represents the definition of the allocated baseline for the system.
The allocated baseline correlates to the second and lower levels of the work breakdown structure.
The contractor set system allocated baseline is established by the engineering documentation (drawings, specification, and software) approved at completion of the Preliminary Design Review (PDR) and, where applicable, the Software Specification Review (SSR). Government approval shall be required prior to making changes to the allocated baseline.
The System PM establishes/approves the allocated baseline(s) and acts as the Configuration Documentation Change Authority (CDCA) for the system and for those CI that are under Government management.
The contractor approves the allocated baseline(s) and acts as the CDCA for those CI that are under contractor management.
Terms and Definitions
There are two primary reviews normally associated with the allocated baseline: the Software Specification Review (SSR) and the Preliminary Design Review (PDR)
Interface requirements for the system and its CI that must be controlled by the Government must be incorporated into the allocated baseline(s). They are defined in the system and item specifications.
The allocated baseline documentation defines the allocated requirements (from the functional baseline or a higher level CI) in:
 Go to Defense Standardization Program Office, ASSIST Database for the most up-to-date and ONLY official version of MIL-HDBK-61A. (http://assist2.daps.dla.mil/quicksearch/)