Software evolution: In the last few years the number of simulation
models that address aspects of software evolution has
increased considerably, making it one of the most modelled
software processes. According to Zhang et al., software process
simulation has to evolve to effectively investigate the everchanging
software processes [43]. This author has contributed
several studies about the equivalence and model conversion
between quantitative and qualitative process modelling. He
uses the model transformation scheme to transform a quantitative
continuous (SD) software evolution process model into its
qualitative form for simulation [44,45]. Araújo et al. [46] also
describe an SD simulation model aimed at supporting the
industrial software decay.