Using This Flowchart Creator Inputs and outputs can be depicted in a Create Block Diagram, while the middle processing steps can be left as a mystery. In engineering, a block diagram is a specialized flowchart form that helps depict a system's big picture. To quickly pinpoint potential problem areas, draw a block diagram of your system highlighting the key components. Block diagrams are useful to account for major system components, visualize inputs and outputs, and understand working relationships within the system because they provide a highlevel overview of the system.