This Effective Technical Diagram is a system diagram for abstracting the highlevel structure of a software system, including its components, their interconnections, and any relevant constraints or boundaries. It's a crucial piece of equipment because it shows how the software system is implemented in the real world and the path it will take to improve over time. Similar to a picture, a diagram can convey more information quickly and clearly than any text. That is to say, an architectural drawing needs to do more than show off pretty shapes. Information about a system's architecture must be communicated to the appropriate stakeholders so that they can gain an understanding of it and use it as a decisionmaking guide.
