统一订购模型（UOM）使用端到端结构化方法描述了一整套系统文档。UOM的范围包括业务需求、分析、设计和实施。从逻辑上讲，这些组件在计量单位中定义为四个卷。第四卷解决了在使用所选实现技术实现系统规范之前必须解决的任何未解决的实现规范。

The Unified Ordering Model (UOM) describes a complete set of system documentation using an end-to-end structured methodology. The scope of UOM encompasses business requirements, analysis, design and implementation. Logically, these components are defined within the UOM in four volumes. Volume IV resolves any outstanding implementation specifications that must be addressed before the system specifications can be realized using the selected implementation technology.