In the system implementation phase of the SDLC, with plunge installation, existing systems are used by the organization until the new one is fully operational.

Name: In the system implementation phase of the SDLC, with plunge installation, existing systems are used by the organization until the new one is fully operational.
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In the plunge installation approach, the new system is installed and the existing one is abandoned immediately. This approach is also known as the "big bang" approach.

In the System Implementation Phase of the SDLC, with Plunge