Engineering design process
The engineering design process refers to how engineers create and validate designs for products, processes and systems---including their lifecycle processes such as manufacture, maintenance and end-of-life considerations such as recycling, remanufacture or disposal. A range of descriptions of the process are available; there is no single standard form, although many aspects are recognisable across individual engineers' practices and companies' processes.
Source: Wikipedia — Engineering design process (CC BY-SA 4.0)