Can somebody explane to me how to do a survey to know the needs of potential users? Do you have always the time and the money to do so? Is it possible to know if an application if a "winner" before investing too much money in it? Does any users can be involved in the developping process earlier than when the application is at the testing phase? Personnaly, I think that from 50% up to 75% of the applications developped are not that useful: I mean you can do whitout much easily.
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