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Software Reuse - Levels

publish date: 2026/06/13 06:39:44.290420 UTC

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Sort the four levels of software reuse from the highest level of abstraction (most abstract, least concrete code reused) to the lowest level (most concrete, directly reusing code).

Object level - directly reusing library objects
System level - reusing entire application systems (COTS)
Abstraction level - reusing design knowledge (patterns)
Component level - reusing frameworks of cooperating objects

Correct Answer

(1) System level - reusing entire application systems (COTS)
(2) Component level - reusing frameworks of cooperating objects
(3) Object level - directly reusing library objects
(4) Abstraction level - reusing design knowledge (patterns)

Explanation

Sorted from highest level of abstraction (most abstract) to lowest (most concrete code reuse): System level (reuse entire applications - most concrete, least design work); Component level (reuse collections of objects as frameworks - significant code reuse with some adaptation); Object level (reuse library objects directly); Abstraction level (reuse design knowledge/patterns - most abstract, no direct code reuse). Note: the diagram places System at the 'System' pole, Abstraction and Component at the 'Abstraction' and 'Component' poles, and Object at the 'Object' pole.

Reference

Software Engineering, Ian Sommerville, 10th edition

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