How do function models, process models, services, and capabilities relate to each other — and how can you use them together to understand and design an organisation?
Function modelling is a deceptively simple but powerful technique: starting from a mission or top-level goal, it decomposes what an organisation must do into progressively more detailed functions and activities, producing a complete hierarchical map of intent and scope. Unlike process models, which focus on sequence and dependency, function models capture the logical what before committing to the physical how — making them an ideal foundation for process design, automation decisions, responsibility allocation, and project planning.
This white paper walks through the technique from first principles: notation, decomposition rules, validation methods, complexity limits, and useful patterns drawn from value chain thinking. It then shows how function models connect to and underpin the other main modelling paradigms — motivation and goal modelling, process and procedure modelling, service design, and capability definition. A clear summary diagram ties them together, showing how each paradigm adds a layer of specificity: goals define what we want to achieve; functions define what we need to do; processes define how we do it; services define the value we provide to other parties; and capabilities define what we must be able to do, with location, resources, information, and technology all specified.
Whether used for a greenfield design, a transformation programme, or simply building shared understanding between business and technical teams, function modelling offers a rigorous yet accessible starting point that scales from a single project to an entire enterprise.
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Originally published as a white paper by Graham McLeod, Inspired.org, October 2014, revised 2020.