It would be more accurate to say that these are classifications of types of procrastination patterns;

Yes. I was going to point out that the concept that there is some fundamental behavior type that can be attributed to people seems, well, in error.

More likely to be patterns, as you said, and I would guess there are some underlying systems that have these these common patterns as effective solutions for procrastination - but how would you even measure "effective procrastination"? How completely you avoid something?