Against the background of digitalization within mechanical engineering, this paper presents an approach to model development processes down to the models, methods and data (MMD) used, using sequences of the Engineering Design Process of a structural carbon fibre reinforced polymer guide vane for a future jet engine. Firstly, the MMD approach is explained in terms of how it can be used to describe development processes and their sub-processes at the most detailed level. Secondly, the sequences of an interactive development process, considering the design, dimensioning and manufacturing disciplines, from the specification of requirements to the implementation of physical and testable functional samples, are described in terms of the modelling approach. Thirdly, both the modelling and engineering processes are combined into a process model of the development process, considering the MMD elements used. It is shown that this approach enables to describe development processes, allowing a variety of analyses to be carried out in relation to the development process in order to understand such processes and improve them in the future.