Dr Hitesh C Boghani and Dr Martin Zach co-authored the article ‘System Dynamics’. Owing its heritage to control theory, system dynamics is a modelling technique where the whole system is modelled at an abstract level by modelling the sub-systems at component level and aggregating the combined output. This allows us to use feedback/feedforward from one component to another within the system, which unfolds when output is viewed against time. Let’s delve into this further by using an example of population dynamics.