Abstract
In this paper, we propose a documentation case(before DAPA establishment) for weapon system development that defines development phases, documents which must be produced as a result of development, and relationship between those documents. To develop the documentation system, US DOD Standard, US Military Standard, and instructions of ROK MND are presented and analyzed in the point of standardizing documents. As a result, development phases and document case which is related to those phases are presented for weapon system development.