Distributed 3-tired C/S model and Object Oriented techniques are broadly apppied in many fields for their advantages. But program developers and designers encounter a lot of problems in process of software development and designment.

• 分布式三层C/S模型、面向对象技术的诸多优良特性使得它已逐渐被广泛使用，但是人们在设计、开发过程中总是会遇到许许多多问题。