Assume that you are a project manager of three projects with the following characteristics:

1. BrainSharing is a complex real-time system whose requirements can be relatively easily identified and are stable.
2. EShare is a website for a local library. Requirements are unclear and are likely to change in the future.
3. MyOrder is an order processing system with a website for a local business. Requirements are unclear but stable (i.e. unlikely to change in the near future).

Which of the above models would you choose for each of your projects and which methods will you use to get the requirements? Your choices should be properly justified