A Method in Isolation

Finally, at the lowest level of abstraction, we can consider the implementation of each method in isolation from the others, and examine how it goes about providing the promised service.

What is important about this hierarchy is that every level is important, and different information is required at every level of detail. A programmer must feel comfortable working at each level, and be able to quickly move back and forth between levels, shedding or acquiring information as needed.

[audio] [real] Text to accompany slide11, in Chapter 2 of An Introduction to Object-Oriented Programming