startupsideastesting
A reader asks how you know an idea is any good
You cannot answer it from your desk, and the good news is you were never meant to.
A reader wrote in with a question I have been turning over all week. "How do you know," she asked, "when an idea is actually worth chasing? I have three of them and I like all of them and I am terrified of picking the wrong one."
I want to be honest, because the honest answer is more useful than the flattering one. You do not know. Not at the start, not from the inside, not by thinking harder. I have spent a good part of my working life around people building things from nothing, and none of the ones who did it well knew, on the morning they began, that the thing would work. What they had was not certainty. It was a cheap way to find out.
That is the part I would gently pull you towards. The question is not which of your three ideas is best. You cannot answer that from your desk, however long you sit there, because right now all three are the same thing: a feeling you have, dressed up as a plan. The useful question is which of them you could test this week for almost nothing.
An idea you love and an idea you have tested are two completely different objects. The first lives in your head, where everything works and everyone says yes. The second has met one real person who was asked to do something small and slightly inconvenient, and either did it or did not. That single moment, someone doing the small inconvenient thing, is worth more than a month of your own enthusiasm, because your enthusiasm was never in doubt. Theirs was.
So I would not ask you to choose. I would ask you to shrink. Take the idea that is easiest to put in front of a real person, not the one that excites you most, and make the smallest version of it that someone could say no to. Not a company. Not a launch. A conversation, a scrappy page, a single offer made to a single person who owes you no kindness. Watch what they do, not what they say, because people are generous with words and careful with effort, and it is the effort that tells you the truth.
You will notice I have not told you which idea to pick. I cannot, and neither can anyone who has not seen what happens when your idea meets the world. That is the quiet freedom in it, actually. You are not being asked to be right. You are being asked to be curious enough to look, and cheap enough about it that looking does not cost you the thing you are afraid to lose.
Pick the one you can test by Friday. The wrong idea tested is worth more than the right idea guarded. And whichever it turns out to be, you will know something on Saturday that you do not know today, which is more than any amount of choosing at your desk was ever going to give you.
More from the journal
More by Rowan Castell
- What the first customer is actually for 7 Sep 2026
- The boring middle nobody puts on a poster 3 Sep 2026
- A reader asks whether it is too early to start 31 Aug 2026
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House rules
- Sign how you like, but be one person. You may use the name on your account, a name of your own choosing, or none at all. What you may not do is wear somebody else's: no pen name of ours, no member's name but your own, and nothing that reads as the studio or its staff.
- Argue with the point, not the person. Robust disagreement is welcome; contempt is not.
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- We may hide a remark, remove it, or close an account to the discussions, and we may do so without notice.
What a chosen name is and is not
A chosen name hides you from the room, not from us. Every remark stays linked to the account that wrote it, and the studio can see that link whenever it needs to. Please treat it as a way to speak freely, not as a way to say something you would not put your name to.
Where responsibility sits
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