[en] With the continuous development and progress of computer technology, nuclear power plant instrumentation control system will use more and more digital technology to replace analog technology. In order to ensure the safe operation of nuclear power plants, strict quality management is required for hardware and software in digital instrumentation control systems. Verification and Validation (hereinafter V&V) is an important means to ensure the quality of application software in digital instrumentation control systems. From the customer's perspective, choosing a suitable implementation team to complete the V&V work and effectively supervising it is a necessary condition to ensure the effective implementation of V&V activities and to ensure the quality of the products supplied. Based on the experience of previous nuclear power plant engineering practices and based on the study and understanding of laws and regulations and standards, this paper puts forward the common requirements that the author would insist on how to choose an appropriate V&V implementing organization to carry out the corresponding activities according to the regulations and standards, as well as the criteria for its judgment and the customer's supervision and management methods. It is of great value and significance for customer or general contractor of Digital Instrument Control System (hereinafter DCS) to select the suitable V&V implementation organization / team as well as the customer's supervision and management. (author)