Jerry R., List: My understanding is that a computer (i.e., mathematical) model is a primarily *iconic* representation that is generated mainly by abduction (Firstness); in particular, it is an icon of *relations*, which is Peirce's definition of a *diagram*. The analysis or processing of it is simply the working out of its necessary consequences; i.e., deduction (Thirdness). Its object in a scientific or engineering context is the actual situation, which is why it has to be tested by means of induction (Secondness).
Regarding CP 5.189, it seems to me that the categories are more properly associated with each step as follows. - The surprising fact, C, is observed - Secondness (induction). - But if A were true, C would be a matter of course - Thirdness (deduction). - Hence, there is reason to suspect that A is true - Firstness (abduction). Of course, as Gary R. has pointed out, the process of inquiry takes place in the reverse order. Regards, Jon Alan Schmidt - Olathe, Kansas, USA Professional Engineer, Amateur Philosopher, Lutheran Layman www.LinkedIn.com/in/JonAlanSchmidt - twitter.com/JonAlanSchmidt
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