What is meant by "categorization" in phonetics? It's supposed to be related to transcription in the sense that transcription requires one to categorize speech in some two dimensions.
I only know about the notion of categorial perception (as in the experiment where English speakers are given recordings with plosive-initial words with different VOT, which may sound either aas [ta] or as [da], and where it was found that the change from [ta] to [da] is abrupt categorical as opposed to being gradual). Does "categorization" have to do with this categorical perception? If so, I don't know what two dimensions are meant. My only guess for two dimensions is place and manner of articulation for consonants. But I don't know if that's the right guess.