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Step one: write five distinct promises
Draft five taglines that each state a different promise, not five rewordings of one. For a Gipim project app, the set might be: Plan the week together. Tasks without the noise. See who owns what. Small teams, clear work. Ship on Friday, calmly. Each line names a different benefit: planning, simplicity, ownership, team size, delivery. Keep every tagline under eight words, avoid superlatives you cannot support, and read each one aloud next to the name. Discard any that need explanation, because a visitor will see the line for only a few seconds.
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Step two: choose a fair test
Show each tagline to a small group matching your intended audience, such as five team leads, without telling them which you prefer. Present the name and one line on a plain mock page or simple card, and ask two questions: what do you think Gipim does, and what would you try first? Record their words exactly. Rotate the order so no line always appears first. If you have a landing page, you can place each line in turn and compare sign-up interest, but only treat small samples as hints, not proof.
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Step three: decide and record the result
Score each tagline on three points: did people describe the right product, did they use the same words you did, and did they say they would try it. Pick the line with the clearest correct description, even if it is not the most clever. Write down why it won and which runner-up could serve as a secondary headline. Then place the winner on the home page, app listing and social profile, and revisit the choice after the first real user feedback arrives.