The playbook
Growth Experiment Planning: Mistakes and How to Fix Them
A common failure in growth experiment planning is running many tests without defining what would change your mind. The consequences often appear later, when someone tries to act on incomplete or misleading information. This guide explains how to recognize the failure, correct the immediate problem, and prevent it from becoming a repeated working practice.
Put the task in context
State the mechanism you expect to change, such as clearer qualification improving lead suitability. Choose a comparison and an outcome tied to that mechanism. A result that contradicts the hypothesis should change the plan rather than be explained away automatically.
Mistake 1: applying the wrong fix
Running many tests without defining what would change your mind. This matters because it changes the assumptions behind the next decision. Look for the condition in actual records before deciding how widely it occurs. A complaint, unusual number, or isolated screenshot can identify a question to investigate, but it is not a complete explanation.
The correction is to specify what result leads to expansion revision or stopping. Begin with hypothesis and trace the relevant context. If the evidence points elsewhere, revise the diagnosis. Keep the original observation so later reviewers understand why the action changed.
Mistake 2: skipping a prerequisite
The sequence matters: state the problem hypothesis and expected mechanism, then choose a measurable outcome and a reasonable comparison, then record the decision rule and operational constraints. Completing a later step without the earlier information can create a convincing output that cannot be trusted. Check which decision depends on which field and restore the missing input.
Mistake 3: using an ambiguous completion rule
“Finished” should mean that a defined result has been checked. For this work, retain hypothesis, mechanism, measure, decision and the evidence behind the decision. A sent request or an updated status may describe activity without showing whether the intended outcome happened.
Mistake 4: losing the reason during handoff
When the work moves to a delivery owner, include the observed problem, the agreed correction, and what remains uncertain. Without that context, the next owner may repeat the same failed assumption or reverse an intentional choice. Ask the recipient to confirm the next step rather than assuming the handoff was understood.
Mistake 5: judging progress using the wrong measure
Use experiments producing usable decisions with an explicit scope and time basis. Activity and business outcomes belong together, but they are different measures. If the activity rises and the useful outcome does not, investigate the process between them instead of celebrating the activity alone.
Repair plan
| Order | Action |
|---|---|
| First | State the problem hypothesis and expected mechanism |
| Then | Specify what result leads to expansion revision or stopping |
| Verify | Record the decision rule and operational constraints |
| Retain | The hypothesis reference, supporting evidence, and decision owner |
Fix the smallest confirmed cause, repeat the affected task, and check neighboring items where the same condition may occur. Expand the repair only when that relationship is supported. Record what remains unresolved so a later review does not start from an incomplete history.
Keep client identity and responsibilities explicit at every handoff. Reusable processes can save work, but goals, account access, and customer information remain specific to each client. Check the context before reusing a previous setup.
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