With the widespread adoption of the "Next Generation Science Standards" (NGSS Lead States 2013), science teachers now aspire to integrate engineering into science instruction, as the standards suggest, yet many do not know how. The first steps are to define engineering and identify tasks that incorporate engineering, which can be difficult and confusing. This article presents a simple explanation of engineering and offers a framework to help teachers determine whether a task is based on engineering. The authors also offer examples of how to integrate engineering in Earth science, chemistry, biology, and physics.