This text is set up differently from most subcourse
lessons. The first section of this lesson uses a
programmed instruction format. The numbered
"frames" present information and/or a question about
presented information. You should work through the
frames in the order presented. Answer each question
that is presented. To check your answers, go to the
shaded box of the NEXT frame. For example. the
solution to the question presented in Frame 7 is found
in the shaded box of Frame 8.
The language used in this subcourse was chosen to
make the lesson easier to understand and may not be
as precise as definitions and terminology you will learn
in the future.