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This is the #1 question we hear when we help clients run online studies. And because we’re consultants, our stock answer is “It depends.” 
The simple answer is:
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| Aim for about 50 participants per user group. |
The more sophisticated answer is:
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The other factor that affects how many participants you need is how many tasks (out of the total) that each participant does.
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| If each participant is only asked a subset of your tasks, you’ll need proportionally more participants. |
To understand this, let’s consider two cases:
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