In this chapter, second-grade students investigate material properties. Students were introduced to the Next Generation Science Standards model of the engineering design process (EDP) and given different materials to test to determine the best solution for creating the roof of a doghouse to withstand rain. This chapter describes how the activity was implemented with a group of primary students in one class period. A materials list, teacher background information, and outcomes are provided. This book selection includes the Table of Contents, Introduction, References, Acknowledgment, Internet Resource, and Index.