To avoid this mistake, you should use a systematic and logical method of decomposition, such as the functional flow block diagram (FFBD) or the N2 diagram.

A Shuttle Service Application Using Mean Stack Architecture - mean-stack-architecture/Redeye Functional Flow Block Diagram.svg at master · gandhi-mansi/mean-stack-architecture ...

Functional flow block diagrams (FFBDs) are a traditional tool of systems engineering and remain popular in some systems engineering domains. However, their lack of formal definition makes FFBDs ...