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Four Essential Elements of a Design Pattern
publish date: 2026/06/12 10:18:11.237752 UTC
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The Gang of Four defined four essential elements that every design pattern description should include. Match each element to its correct description.
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Element
Name
Solution description
Problem description
Consequences
Description
A meaningful reference to the pattern - patterns become part of the vocabulary for discussing designs
Explains when the pattern may be applied, including motivation (why it is useful) and applicability (situations where it may be used)
A template for the design solution that can be instantiated in different ways; describes the parts, their relationships and responsibilities; often expressed graphically showing object relationships
A statement of the results and trade-offs of applying the pattern; helps designers understand whether the pattern can be used in a particular situation
Correct Answer
(1) Name,A meaningful reference to the pattern - patterns become part of the vocabulary for discussing designs
(2) Problem description,Explains when the pattern may be applied, including motivation (why it is useful) and applicability (situations where it may be used)
(3) Solution description,A template for the design solution that can be instantiated in different ways; describes the parts, their relationships and responsibilities; often expressed graphically showing object relationships
(4) Consequences,A statement of the results and trade-offs of applying the pattern; helps designers understand whether the pattern can be used in a particular situation
Explanation
The four essential elements: (1) Name - a meaningful reference that becomes vocabulary; (2) Problem description - when/why the pattern may be applied (motivation and applicability); (3) Solution description - not a concrete design but a template showing parts, relationships, and responsibilities, often expressed graphically; (4) Consequences - results and trade-offs of applying the pattern to help designers decide if it fits their situation.
Reference
Software Engineering, Ian Sommerville, 10th edition
