All you would have to do is go and pick up the best deck applicator and go to work. The diversity in some of our audiences is a real challenge to application. But even if our audience is not diverse, there are still too many people to really know them as we should. When we look at, listen to, and interact with our audience, we invent grids to categorize them. Some of our grids are closer to reality than others, but we all do it.
Culture plays a role.
Our biblical doctrine of man plays a role. And our theory of how our learners best learn plays a role among many other possible factors influencing the grid with which we see our audience. That common thread has to do with what we can learn and how well we can learn. Affective level, Behavioral level, Cognitive level, Dispositional level. Each domain of learning, has various levels, from knowledge about something to comprehension, to analysis, etc.