Amazon.com description: Product Description: Written by recognized leaders in the calculator reform movement who are experts on how to teach using the graphing calculator, this text expresses the authors' belief that success in mathematics and related fields depends on a solid understanding of functions. They use the graphing calculator to present mathematical concepts, to illustrate the use of functions in mathematics, and to explore the use of functions in applied and theoretical problem situations. Students use graphing calculators in learning nearly every new topic or concept. This allows them to explore a wider class of applied and theoretical problems than is possible with conventional pencil-and-paper methods. Key strokes for the TI-81 and TI-82 are demonstrated in the text so that students master manipulation of technology tools as they develop deeper conceptual understanding.