Simulation process modelling for managing software evolution.

Software used for real world problem solving must be continually adapted and enhanced to maintain its fitness for purpose. These activities are likely to increase the complexity of the evolving system unless work is also undertaken in order to control and reduce complexity. In order to manage these competing requirements, tools are required to estimate the amount of work and resources to be applied to each. A systems dynamics model is presented that can support decision making regarding the optimal personnel allocation over the system lifetime. The model provides a useful tool to plan and manage long-term software evolution.