Chapter 2 – Testing Throughout the SDLC
Incremental Development Model – ISTQB Definition
Last Updated: July 12, 2026 · SoftwareTestPilot QA Team
Official ISTQB Definition
A development lifecycle in which the product is designed, implemented and tested in a series of increments, each adding functionality.
In simple words
You ship the product piece by piece, adding features over time instead of all at once.
Exam tip
Incremental focuses on adding features; iterative focuses on refining them — often combined in Agile.
Related terms
- Iterative Development ModelYou build the product in loops, learning and refining each time, instead of one big waterfall.
- Agile DevelopmentShort sprints, close collaboration, working software over documentation, and continuous change.
- Continuous TestingEvery commit triggers tests — unit, integration, sometimes end-to-end — so risks surface within minutes.
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