This work concentrates on reuse-oriented software development. We propose an approach in which we incorporate reuse components in the initial phases of the software development process, that is to say, requirements specifications. These components, use case in the pattern form, reused during the requirements capture, allow a visualization of the system to be implemented. On the other hand, they also facilitate some normalization in the requirements process and, further, can be reused in several applications; this is obtained more easily with patterns. The primary motivation of this study derives from the fact that system requirements represent abstract knowledge of which a great part can be reused in other systems.