Aiming at the low level of automation of case retrieval in case-baseddesign, the variant design used in case-based fixture design was studied in detail.
The approach to use case modeling can be considered a top-down approach for SOA design, where service operations are identified based on where they are needed.
用于用例建模的方法可以视为SOA设计的自顶向下方法，服务操作基于所需的场合进行标识。
3
At last, several key enabling technologies, namely product data management, casebaseddesign, design for cost, virtual design and collaborative design are discussed in detail.