Use a team of three for version 1.0

From Getting Real – 37 Signals

For the first version of your app, start with only three people. That’s the magic number that will give you enough manpower yet allow you to stay streamlined and agile. Start with a developer, a designer, and a sweeper (someone who can roam between both worlds).

Now sure, it’s a challenge to build an app with only a few people. But if you’ve got the right team, it’s worth it. Talented people don’t need endless resources. They thrive on the challenge of working within restraints and using their creativity to solve problems. Your lack of manpower means you’ll be forced to deal with tradeoffs earlier in the process — and that’s alright. It will make you figure out your priorities earlier rather than later. And you’ll be able to communicate without constantly having to worry about leaving people out of the loop.

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The WDDinc perspective: We are a firm believer in small teams. Communication amongst ourselves and, more importantly, with the client is easier and the project is lot more enjoyable for all.