Digital BW, The Print

Greetings, group.

When trying to linearize for a particular printer/paper/ink 
combination, what is the best way to determine the Aims for each %K 
value? Is linearization supposed to be determined strictly 
mathematically or is there some element of perceptual linearization 
involved?

I believe most RIPs like StudioPrint, InkJet Control, and probably 
QTR (I haven't tried it yet) either have built-in Aims or simply 
allow you to enter your density measures and then calculates it 
automatically, but I'm curious about the algorithm(s) that are used 
to establish the linearization.

Thanks for any insight.
Peter.