Phase Containment is incorporating QA into all the phases of SDLC. It results in Defect Prevention. If Qa team performs Requirements Review, Design Review and Code Review, defects would be few when actual application is tested. That means we have prevented many defects by performing reviews at each stage of SDLC.

Prevention of bug is more cost effective & time effective. By involving the testing Team members right from the Requirements Phase itself proves to reduce the bugs very drastically by taking their views and using their past experiences.
Reviewing the documents prepared in each phase of SDLC against the requirements taken from the Customer by conducting Review meetings, Inspections and walk through. This will prevent the bugs rather than fixing them later at the testing phase....

we use to have a healthy interaction with QA starting from requirement phase.
Document review BY qa helps a lot in finding defects at early stage. finally a unit test done by QA at developers place finds out the defect before it comes to QA.

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