Shift Left
Shift Left is a development and testing approach that moves testing and quality activities earlier in the software development lifecycle.
“A test approach to perform testing and quality assurance activities as early as possible in the software development lifecycle.”
(Definition reproduced from the ISTQB Glossary. Copyright belongs to ISTQB.)
View the complete ISTQB GlossaryWhat is Shift Left?
By detecting defects earlier, Shift Left reduces rework, lowers costs, and improves overall software quality.
Early testing: Testing begins during requirements and design.
Defect prevention: Problems are found before implementation progresses.
Collaboration: Developers and testers work together earlier.
Real World Example
A regulated product team is preparing a release where Shift left appears in reviews, test design conversations, or defect triage rather than as an isolated glossary word.
The risk is that the team treats Shift left as interchangeable with nearby ISTQB terms. That makes test scope blurry and can lead to weak evidence for the release decision.
The tester anchors the discussion in the official definition, asks where the concept appears in the product, and designs examples that show the difference between Shift left and similar ideas.
The page becomes useful in practice because Shift left is connected to a specific testing decision, not memorized as a detached definition.
Practice Questions
Question 1
Which statement BEST describes Shift left in the context of ISTQB terminology?
Question 2
A tester needs to explain Shift left to a non‑technical stakeholder. Which approach is MOST appropriate?
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