Validation is the phase which too many new entrepreneurs will unfortunately skip. It separates the organized innovators from the just hopeful and enthusiastic ones. Validating your business idea basically means asking questions, considering your ideas, choosing the best and discussing about it with experts and potential customers.
Validation saves time and money. Usually the most useful question is whether the potential customer is willing and capable to pay for your service or product. Ideas are cheap. You must also ask yourself if you are willing and capable to produce the service or product. The goal of the validation process is to find out if the product is viable. And always you should remember to leave the building: go out and discuss your ideas.