MIL-HDBK-61A: Configuration Identification
5.2 Product Structure
Product Structure, also referred to as system architecture, refers to the identifiers, internal structure, and relationship of system components and associated configuration documentation. Product structure, derived from the functional analysis and allocation process of system engineering, may be depicted graphically as a tree structure or as an indentured listing.
As a program matures through its early phases, the systems engineering process produces the optimized functional and physical composition of the system architecture to the level that it is necessary for the Government to specify and control item performance. This is the lowest level at which CIs are designated during the Engineering and Manufacturing Development Phase of the life cycle. Management tools such as specification and drawing trees, and work breakdown structures are all views of the product structure which are directly relatable at the CI level.
Program and contract work breakdown structures (WBS) are views of the product family tree structure showing the hardware, software, services, data, and facilities against which costs are collected. The WBS relates the elements of work to be accomplished to each other and to the end product. CIs are identified as work breakdown structure elements. Uniform element terminology, definition, and placement in the upper three levels of a WBS are common for many categories of defense materiel. The WBS is extended to lower levels by the DoD component and contractor(s).
Product structure activity guidance is included in Table 5-111, above.
For correct application of this information, see NOTE on Contents page