Simulation is more essential than ever in today's fast changing and unpredictable business, social and political environment. It is an indispensable tool for managing risk in our global supply chains. It can support decisions such as  Cap-ex and op-ex where millions of pounds of investment are at risk if the design of facilities or process lines is not right first time at commissioning;  where time to market for new products and services is decreasing continuously;  for aligning product design with the manufacturing process design over the entire lifecycle of both the product and the process;  for predicting impacts on our systems of events outside of our control in the supply chain Simulation is being applied not just for one-off decisions as it is traditionally used, but now also as a continuous decision support tool when operated as a ‘digital twin’, within a closed loop system, alongside our physical resources for de-risking cap-ex and op-ex decisions. Simulation doesn’t always have to mean computer-based simulation. For example, a physical role play simulation enables us to both understand causation of decisions and dynamics of complex processes within a ‘safe’ environment.

Whatever form of simulation: physical, discrete event, multi-agent, or systems dynamics, the authors of this Pocketbook understand the value of using simulation to de-risk decision making, particularly when all of the information we need is not available and we don’t have access to a crystal ball to tell the future. This book focusses on computer-based simulation and the best practice shared by expert users and the non-computer-based activities that precede and follow the computer-based phases of a typical simulation project. It is not intended to replace or compete with the widely available existing instruction publications, rather to compliment these from a practical perspective.