page_title: Function model
section_title: Function block diagram
hierarchical_section_title: Function model / Functional modeling methods / Function block diagram
caption_attribution_description: English: A functional block diagram of the attitude control and maneuvering electronics system of the Gemini spacecraft. (McDonnell, "Project Gemini Familiarization Charts," June 5, 1962
context_page_description: In systems engineering, software engineering, and computer science, a function model or functional model is a structured representation of the functions within the modeled system or subject area.
  A function model, similar with the activity model or process model, is a graphical representation of an enterprise's function within a defined scope. The purposes of the function model are to describe the functions and processes, assist with discovery of information needs, help identify opportunities, and establish a basis for determining product and service costs.
context_section_description: A functional block diagram is a block diagram, that describes the functions and interrelationships of a system. The functional block diagram can picture:
  Functions of a system pictured by blocks
  Input and output elements of a block pictured with lines, and
  Relationships between the functions
  Functional sequences and paths for matter and or signals
  The block diagram can use additional schematic symbols to show particular properties.
  Specific function block diagram are the classic functional flow block diagram, and the Function Block Diagram (FBD) used in the design of programmable logic controllers.
caption: Functional block diagram of the attitude control and maneuvering electronics system of the Gemini spacecraft. June 1962.
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