Guy Kawasaki’s 10 Questions to Ask Before You Join a Startup
mint.com
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2- Does the (potential) market size justify the resources we will invest in it?
3- Can it create enough revenue to support development, and turn a profit by MM/YY?
2. Can it be done?
3. Should it be done?
4. Will it be worth it?
5. How do we make it better?
1. When the company knows exactly what they're going to build, I'm going to be worried the idea is somebody's "brainchild", and that any suggested changes to the product will be met with a lot of resistance. No plan is said to survive contact with the enemy. This also applies for product concepts and the first (potential) customers. The second half of the question (Can we build it?), will always be answered in the affirmative. We're hopelessly optimistic that way.
Questions 2 and 3 are questions that are very important, but what's the point of asking when you can't tell if the answer is a realistic forecast or some numbers pulled out of nowhere? A company that has absolutely no idea about market size, or the revenue model can still stumble upon a working business model.
Questions that can only be answered in hindsight won't give you the information you need before you join.