Option 1:
If you are going in for a waterfall model kind of development in which you would be getting the software developed once the requirement analysis process is complete in that case we provide comprehensive documentation covering all requirements gathered in one or all of the following depending on the needs of the project

• Prototypes and other diagrams
• Flowcharts
• System Requirements Specification Document (SRS)
• Functional Specifications Document (FS)
• Use Cases

Option 2:
In case of iterative and rapid software development, when we provide requirements gathering services, we think of an iterative process and provide simple sketches, screen drawings, some use cases, and even functional, running prototype software pieces that will help with that iterative process. All of these make up the requirements.