Research of design for system-level testability and system partition

With the development of science and technology, the system structure and function of various equipments are more and more diversiform, the technology is more complex and the structure is more compositive. So it is very difficult to master the technology of faults detect and isolation. In the face of this challenge, design for system-level testability has become the most important method to raise the optimal rate between performance and price in the whole life span period of product. This article introduces the theory of design for system-level testability and system partition based on fuzzy directed graph theory, and lastly points out the improvement.