terry,
i've read your response to my question to you to give us an example of a predictive "design theory" which you and ken are advocating. i've read it on my cell phone and wanted to answer on my computer but can't find it on either device.
part of your message complains of feeling attacked. this is far from my intention. i was aware that i posed a challenging question whose answer would clarify what you had in mind regarding design. i had asked you because i have the feeling you are subscribing to a notion of theory taken literally from the natural sciences in which predictions is the currency of publishable success. when you refer to theories you have a tendency to talk about generalities, including what constituted evidence, etc. i was more interested in design
as a communication scholar i am dealing with theories of human communication all the time, with conceptions of dialogue, with the relationship between speech acts and what they accomplish, with models of influence, with issues of power, submission, and liberation. such theories then to be propositional, occasionally based on mathematical formulations, for example, limits on communication in information theoretical terms. although i have proposed some theoretical propositions on design, but they do not reach the requirement of the kind of predictive specificity you seem to impose.
so, i just want to read an example of a valid design theory - not assertions of requirements for one, such as that they should be evidence based, predictive, general, useful for designers, etc. i think this simple question deserves an answer from a vocal proponent of design theory.
klaus
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