In the book “Principles of Engineering Design” by Vladimir Hubka, the following picture is visible:
It describes a process as a function of multiple inputs, outputs, and confounding variables. He calls it a technical process, and in the photo above it’s a little abstract, which he points out. However, this system can represent basically any process. A more concrete example he gives is the following:
However, notice that this is just a design in its most simple form. The design of a process and how a process is designed. It’s a one to one relationship. These are designs that describe fundamental engineering processes. In other words, design holds significance in engineering for being able to describe and design a process with all of its respective connections.