In the field of Software Engineering software risk management is an important area. Due to the complex nature of software development industry there are many types of risks which can cause project failure. From such risks developing wrong software functions is one due to which many problems can arise. If effects of this risk are not estimated it would pose problems for the success of the project. By estimating the effects of developing wrong software functions developer will come to know which problem they have to face with the occurrence of this risk and considering these effects developer can take appropriate action to manage this risk. So, We are proposing a FCM based tool to estimate the effects of developing wrong software functions.