The engineering design process was a methodical series of steps that engineers use in creating functional products and processes. The process is highly iterative - parts of the process often need to be repeated many times before another can be entered - though the part(s) that get iterated and the number of such cycles in any given project may vary. The steps tend to get articulated, subdivided, and/or illustrated in different ways, but they generally reflect certain core principles regarding the underlying concepts and their respective sequence and interrelationship.