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    Can I change the control variant after the test starts?

    From the Tailor AI team · Reviewed

    controlexperimentsmid-testbest-practices

    Answer

    Best practice: stop and restart instead of changing control mid-test.

    If you want a new baseline, end the experiment using the Tailor Chrome extension, set the new control, and run a fresh test. Changing control mid-flight makes results harder to interpret.

    What I'd do next

    1. Stop the current experiment using the Chrome extension.
    2. Set the new control and launch a fresh test.

    Caveats

    Changing control mid-flight contaminates the measurement window.

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