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Comment by jlukanta | Hacker News Reader

I find it difficult to come up with the right validation criteria. Would you share your thought process? How did you come up with specific numbers?

  Of a sampling set of people searching for Charades online, at least 25% will sign up
  to check out the game.

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It's fairly subjective at this stage, and is more of a judgment call than a science. I went with the following assumptions while putting down the 25% metric: * Conversion rates on vanilla sign up pages (with not a lot on the page) are generally not that high. I'd read that 8-10% was common. * Users already searching for charades online would be motivated to check out the ad (in my mind, this justified looking at a higher rate) * Since this was SCM based, it was not granular from a demographic perspective - likely had a mix of early adopters, mainstream users, etc.

Hope this helps. I'd love to hear how others are doing this.

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