International Science and Technology Journal

the field of computer networks is one of the most important areas of the development of a large and accelerating in the field of technology Information. No one is aware of the extent of the large services contributed by the computer networks in several fields of science, business, economic and medical. For example, by computer networks became Financial, commercial, buying and selling transactions between companies, banks and various factories are made in a smooth, fast and flexible manner with the least time, effort and cost.. In this paper, we discussed one of the most important topics related to the design of computer networks, which is the development of PPDIOO methodology[1], which is used in the design of the computer network to be compatible with projects of a technical nature, in other words projects that need practical application and actual implementation on the ground. As this methodology did not care about the practical aspect and all its focus on the theoretical side. So, have added important points to each stage of the methodology from the first phase (prepare), the final to the last phase (Optimize) in addition to, identifying the programs and tools used at each stage of the methodology to cover all aspects of the project of a technical nature. In order to ensure the feasibility of this development and improvement on this methodology, we conducted a questionnaire within the Higher Institute of Computer Technology in Benghazi. The students of the graduation projects and the teachers within the Networks Department included the fall of 2017 and Spring 2018, who used the methodology after the process of improvement and development in their graduation projects. Where the results of the questionnaire were more than wonderful, the most important of which is that the modified methodology saves time and effort in completing graduation projects.