All courses
offer opportunities for the student to make wise decisions about the level of
understanding achieved. The quality of the mathematical content and instructional
use have been thoroughly documented in a wide range of situations and with great
numbers of students. Carefully developed, revised, and perfected over the last
25 years, this is mathematics instruction at its finest. 100% 30-day money-back
guarantee if not completely satisfied.

Use either the
online course or the textbook for instruction. The material and quality of the
instruction are nearly identical. Some students prefer a book. Others like the
web site. Some students prefer both. Whatever works best is the rule to follow.