Book ChapterDigital resources are stored online in your NSTA Library.
From an early age, children have a good idea of what being fair means. In a fair test, everything is treated in the same way (controlled), apart from that which is deliberately changed or varied. In this way, scientists can determine whether a change makes a difference. This chapter builds on the idea of the fair test and introduces the notion of controlled experimental conditions. In the second lesson, Finding Out How Much It Matters, attention is focused on the systematic variation of one variable. This sample chapter also includes the Table of Contents, Note to Teachers, Acknowledgments, About the Author, Introduction, and Index.