2. Understanding the users needs is mission critical to a successful SDLC.

3. The Waterfall methodology is the most straightforward of all of the SDLC methodologies, because there are strict phases and each phase needs to be completed first before going to the next phase. There is no going back.

4. An advantage of the Iterative model is that it quickly delivers a working product.

5. An advantage of the V model is that each stage has a corresponding testing activity which helps to identify missing requirements, and incorrect design early in the life cycle.

6. The DFD (Data Flow Diagram) should be used in lieu of a descriptive prose representation of a users process.