In this video Paul Andersen explains the first step in the design process, defining and delimiting the engineering problem. Design requires a clear definition of the problem and this is done by addressing both the constraints and criteria of each solution. This will become increasingly important as future problems require complex solutions. A K-12 teaching progression is also included.
https://thewonderofscience.com/videos/2017/12/10/ets1a-defining-engineering-problems