Difference between revisions of "Function (glossary)"

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<blockquote>(1) ''A system outcomes which contribute to goals or objectives. To have a function, a system must be able to provide the outcome through two or more different combinations of elemental [[behavior (glossary)]].''  (Ackoff 1971)</blockquote>
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<blockquote>(1) ''A system outcomes which contribute to goals or objectives. To have a function, a system must be able to provide the outcome through two or more different combinations of elemental [[behavior (glossary)|behavior]].''  (Ackoff 1971)</blockquote>
  
<blockquote>(2)'' An action, a task, or an activity performed to achieve a desired outcome. '' (Hitchins 2007)</blockquote>
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<blockquote>(2)'' An action, a task, or an activity performed to achieve a desired outcome.'' (Hitchins 2007)</blockquote>
  
 
<blockquote>(3)'' A broad work area encompassing multiple related disciplines (e.g., Engineering, Finance, Human Resources, etc.).'' (Created for SEBoK)</blockquote>
 
<blockquote>(3)'' A broad work area encompassing multiple related disciplines (e.g., Engineering, Finance, Human Resources, etc.).'' (Created for SEBoK)</blockquote>
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(2) Hitchins, D. 2007. ''Systems Engineering: A 21st Century Systems Methodology''. Hoboken, NJ, USA: John Wiley & Sons.
 
(2) Hitchins, D. 2007. ''Systems Engineering: A 21st Century Systems Methodology''. Hoboken, NJ, USA: John Wiley & Sons.
  
(3) and (4)These definitions were developed for the SEBoK.
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(3) and (4) These definitions were developed for the SEBoK.
  
 
===Discussion===
 
===Discussion===

Revision as of 20:32, 15 April 2013

(1) A system outcomes which contribute to goals or objectives. To have a function, a system must be able to provide the outcome through two or more different combinations of elemental behavior. (Ackoff 1971)

(2) An action, a task, or an activity performed to achieve a desired outcome. (Hitchins 2007)

(3) A broad work area encompassing multiple related disciplines (e.g., Engineering, Finance, Human Resources, etc.). (Created for SEBoK)

(4) A function is defined by the transformation of input flows to output flows, with defined performance. (Created for SEBoK)

Source

(1) Ackoff, R.L. 1971. "Towards a System of Systems Concepts". Management Science. 17(11).

(2) Hitchins, D. 2007. Systems Engineering: A 21st Century Systems Methodology. Hoboken, NJ, USA: John Wiley & Sons.

(3) and (4) These definitions were developed for the SEBoK.

Discussion

(1) is the system science definition. All systems have behavior, but to be able to function in a certain way they must have a certain richness of behavior. For example, fight, flight or hide are behaviors; while response to external threats is a function.

(2) is the more traditional Systems Engineering definition, in which functions are identified top down based on needs and then decomposed and allocated to lower level system.

(3) is a HW/SW or human system component definition, describing a function which can be performed by a single part of the system with identified performance.

(4) is a management definiton, describing how similar functions are collected in organizational units.

SEBoK v. 1.9.1 released 30 September 2018

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