With over 20 years of teaching experience, Professor Duffy understands the challenges that students and professors face everyday. Before starting the keystrokes of a project, Duffy takes more time to explain the significance of what students are about to do and learn. This conceptual approach builds computer skills and encourages critical thinking. After completing the projects in these books, students will be prepared to take the core Microsoft Certification exams for Excel 2000. Successful completion of these exams gives students measurable, marketable skills.