Interdisciplinary instruction is a way of approaching curriculum by organizing content and processes from more than one discipline around a central theme, issue, problem, topic, or experience (Jacobs 1989). Teachers can start the process of designing interdisciplinary units by examining the standards in different curricular areas and finding commonalities. One place to start is with the National Science Education Standards (NRC 1996) unifying themes. The unifying themes (e.g., systems, change, models), as well as connected tools (e.g., measurement, representations), and shared processes (e.g., observing, predicting) are places for making meaningful curricular connections across disciplines.