Shift left is a software testing approach where software testing is performed (moved or shifted) to the left / earlier in the Life-cycle. This basically is "Test Early and Test Often".
- In the Traditional Model, requirements and design happen to the left, and testing of those requirements to the right. As the project progresses, the testing effort increases.
- Consequently later the defects are found, the costlier it becomes to fix those bugs
- In Shift Left, testing is performed during early stages by engaging early in the project lifecycle.
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