Abstract: Most of information systems use nowadays were modeled and documented using structured approach. Expansion of these systems in terms of functionality and maintainability requires shift towards object-oriented documentation and design, which has been widely accepted by the business. In this paper, we compared between Data flow diagram and Use case diagram to find out the strengths and weakness over each of them. As a result, the author concluded that DFD still powerful tool through system analysis and design process, and can be included in object- oriented approach.