What Is Functional Decomposition?

In general, the total function of a product or system can be decomposed into several sub-functions, and each sub-function can be further decomposed into several secondary sub-functions. This continues until each sub-function is decomposed into functional units. This structure, which is composed of sub-functions or functional units according to their logical relationship, is called a functional structure. The inter-relationships of sub-functions or functional units can be described by diagrams. The diagrams that express the inter-relationships or subordinate relations of sub-functions or functional units are called functional structure diagrams. ^[1]

The functional structure diagram is mainly used to more clearly reflect the internal organization relationship, clearer the internal logical relationship, and to standardize the respective functional parts at a glance and make them organized.

Functional structure diagrams are mostly used in modular scenarios such as program development, engineering project construction, organizational structure analysis, and website design.

Common software such as Microsoft Office Visio, Visio is the software in the office software series responsible for drawing flowcharts and diagrams. It is a software that facilitates IT and business personnel to visualize, analyze and communicate complex information, systems and processes. Use professional-looking Office Visio diagrams to advance your understanding of systems and processes, gain insight into complex information, and use that knowledge to make better business decisions.