You might characterize what we did in class this week as refining a subject down to its essential parts. At first a new subject is overloaded with information, and you may be drawn into rendering it with undifferentiated specificity. After a couple of versions, though, the most telling aspects of the subject a begin to reveal themselves. Compared to these features, the rest seems optional. you can include it if you like, but it is not essential to a description.