It is a format that is suitable for large software because the analysis and risk management as an expense that may not be good for small projects and risk management experience required.
It is a model that works for large software. Because the analysis and risk management is used. Expenses that may not be good for small projects and to manage risk has to be experienced.
As a perfect model with large software The risk analysis and management for use. Pay may not be for small projects and who will manage the risk must be experienced.