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Use Case - Integrated vs. Separate Evolution Models

publish date: 2026/06/24 21:38:18.165353 UTC

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A mobile app company writes, releases, and maintains its own app entirely with the same internal team across its lifetime, releasing updates every few weeks. A separate enterprise software vendor builds a custom payroll system for a client, who then hires a different consultancy to handle all future support. Which evolution model applies to each situation?

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Scenario

Mobile app company managing its own app end-to-end
Enterprise vendor handing off payroll system support to a different consultancy

Model

Custom software maintenance model with discontinuity
Seamless software product evolution model

Correct Answer

(1) Mobile app company managing its own app end-to-end,Seamless software product evolution model
(2) Enterprise vendor handing off payroll system support to a different consultancy,Custom software maintenance model with discontinuity

Explanation

The mobile app company exemplifies the seamless software product evolution model: the same organization and methods are used throughout the lifetime of the software. The payroll system scenario shows the custom software maintenance model, where responsibility shifts to a different organization, creating likely discontinuities in documentation, knowledge, and process consistency.

Reference

Software Engineering, Ian Sommerville, 10th edition

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