Development of inter-college e-commerce system through extending a legacy system

We developed the inter-college e-commerce system that enables colleges to provide extension courses to each other. The system streamlines the internal operations (such as registration and fee management), and automates flow of data between colleges and the WWW. In the development, we extended a legacy system, because its use is necessary for efficient back-end operations. In this paper we propose a method of extending a legacy system into an end-to-end integrated EC system using Internet EDI, triggers, and intermediate DB in a cost-efficient manner.