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With the development of Internet technology, methods, and tools of the development of information systems, especially in electronic commerce field, leads to make theoretical and practical studies for developing electronic commerce systems. Since Yemen is a developing country, we have to pay a great deal of attention to the great role that the Internet plays in the world of business. This thesis presents study of the state of development information systems in Yemen especially in E-Commerce information systems, also focusing on the methods and tools which were used in the developing information systems in Yemen, and the rate of using Object-Oriented Software Engineering in the universities and software companies of Yemen through developing information systems. The study showed that about 95％ of information systems in Yemen were developed by using traditional software engineering, only about 5％ of information systems were developed by using Object-Oriented software engineering. Since Yemeni government is moving towards E-Commerce & E-Government and Based on the above results, this thesis also presents case study of developing electronic commerce information system of Online Bookstore System (OBS) for sales the books through the Internet.
On one hand , the Online Bookstore System has been developed by using the Object-Oriented technology as software engineering methodology based on Coad & Yourdon method for Object-Oriented Analysis model which has five layers and Object-Oriented Design model which has four components, because the Coad & Yourdon method is easy to study and apply. The case study can be seen as 3-Tier Architecture E-Commerce System which has become popular today. On the other hand, every developer, programmer, and who interested in developing information systems especially in electronic commerce systems and software engineering can make use of such kind of this thesis.