This book describes CoSMoS (Complex Systems Modelling and Simulation), 
    a pattern-based approach to engineering trustworthy simulations 
    that are both scientifically useful to the researcher and scientifically credible to third parties. 
    This approach emphasises three key aspects to this development of a simulation as a scientific instrument: 
    the use of explicit models to capture the scientific domain, the engineered simulation platform, and the experimental results of running simulations; 
    the use of arguments to provide evidence that the scientific instrument is fit for purpose; 
    and the close co-working of domain scientists and simulation software engineers.
                
  
    In Part I the authors provide a managerial overview: 
    the rationale for and benefits of using the CoSMoS approach, 
    and a small worked example to demonstrate it in action. 
    Part II is a catalogue of the core patterns. 
    Part III lists more specific “helper” patterns, showing possible routes to a simulation. 
    Finally Part IV documents CellBranch, a substantial case study developed using the CoSMoS approach.