Design the experiment and define the success criterion
Frames one focused test — isolates the single variable, writes the hypothesis, and sets the success criterion and run window — before anything launches.
In / outGrowth hypothesis + metric context → experiment design with variable, hypothesis, success criterion, and run window
You might say…
“I keep 'testing' things by feel and never actually knowing what moved what — I need to design the experiment properly before I run it.”
What it does
Frames one focused test to move a specific growth metric — isolates the single variable (subject line, opt-in headline, lead magnet, posting format or channel), writes the hypothesis, and sets the success criterion and run window upfront before anything launches. Used to set up a deliberate, time-bounded test. Single human-in-loop judgement on what to test and how success is defined.
Trigger: Use when a growth hypothesis is ready and needs to be turned into a time-bounded, single-variable test with a pre-defined success criterion.
Recognise the problem?
The primitives are the commodity part. The fastest next step is a conversation about composing them into something that works for you.
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