Configuration identification is used to further define and verify the structure of products (configuration), as well as to identify the products themselves and their documents. From it, changes are controlled, accounting, verification and status reporting are carried out. The functional-content identification defines reference configurations and their validity step by step and in coordination with the project phases. They form the basis for any changes, for cost determination, deadlines, technology assessments, etc. Formal identification structures the product and makes a selection of configuration units (CU). After defining the product documentation, numbering and labeling of the individual elements follow. Finally, product, configuration and documentation trees are compiled, which must be maintained at regular intervals. (Source: GPM)