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It's extremely rare for you not to know anything of the requirements. I built an entire system for Shell without ever talking to anyone. I just looked at promotional material, attended public presentations etc and from that I built a prototype. BMW don't ask you for your requirements when they design the next 5 series. They know what a good car is and likewise you as a professional should know what a good system is.Seriously, there is nothing you can do without requirements. Without requirements, anything you work on could be useless once requirements are known.
That's perhaps more JAD."RAD works" - yes, but that presumes customer participation throughout the project for testing and specifications
I worked with one of the top handful of Indian suppliers and they did very well in a structured environment. Subsequently they were used for more unstructurable work ( I think it was Business-as-Usual/Support) and failed completely. However I had a few over here and they quickly learned how to get on with things without having everything spelled out up front.I just view leaving the requirements unstated until afterwards as a particularly dangerous affair. It is also particularly difficult and dangerous when working with "offshored" development teams. Those teams (eg. India) REALLY REALLY REALLY do not like working without firmly structured requirements.