Fvc is the key component of the ivc - based - vi system , and the kinds and amounts of vi assembled by the instrument assemblage site of the developing system depend on how many reusable controls in the ivc base . optimizing design method of control is discussed through discussing the cohesion , coupling and reuse of control 智能虚拟控件是智能控件化虚拟仪器系统中的核心组成部分,由开发系统中的仪器拼搭场拼搭出的虚拟仪器的种类和数量,有赖于智能虚拟控件成品库的可复用控件的种类和数量的多少。