Kano model, RUP, Volere method

RUP is often being regarded as THE process for developing software, with UML as the workhorse for requirements notation.

RUP also brings its own ideas about requirements gathering and modelling, but the Volere method is a method for requirements gathering and organizing, as well as the Kano model.
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It is interesting to compare the number of hits on google and bing, showing the relative publicity about these methods:



As I already used elements of the Volere method in my current requirements assignment, I certainly want to have a look at Kano soon.