Step 0. Remove all changes between test and production environments that introduce new bugs, no matter how subtle or undocumented.

    I assume you test in the production environment.

    Or, you have a test environment that:

    • Duplicates all the Production System's configurations and databases exactly.
    • Duplicates loading and all external interface interaction with the Production System exactly.
    • Has exactly the same hardware as your production system.
    • Has a parallel set of operation's people performing exactly the same operations on it.

    Oh, and while you are at it, how do you setup a test environment that's exactly like the production environment when the test environment has additional loading from the program under testing? Which is why I assume you must be testing in production.

    The fact is, differences between your test and production environments cannot _introduce_ new bugs into a program, only exhibit bugs that are inherent in the program that are expressed in different environments.

    In reply to Re^4: How to write programs? by jordanh
    in thread How to write programs? by artist

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