How does the risk factor affect the spiral model of software development?

Ans: Risk Analysis phase is the most significant part of "Spiral Model". In this phase all possible (and available) alternatives, which can help in developing a cost effective project are examined and strategies are decided to use them. This phase has been added specially in order to verify and resolve all the possible risks in the project development. If risks indicate any type of uncertainty in needs, prototyping may be used to proceed with the available data and search out possible solution in order to deal with the potential changes in the requirements