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Managing Production in an Ideal World

(Warning: proselytization ahead!)
• Never develop in a production environment.
• Developers work in a development environment, and check in their code when they are confident of it.
• QA checks out code into test environment for testing.
• QA "tags" the version they have tested (or tells the developers what to fix)
• Production system administrator checks out the QA-tagged version into the production environment.