The STEM QUEST Thinking Pages: System Changes invite students to explore how systems work by identifying one part of a system and explaining— in one or two ways—how the system would change if that part were altered. This activity encourages cause-and-effect thinking, careful observation, and clear explanation. Thoughtful classroom use and constructive feedback may also help inform how future versions of this page evolve over time. While this resource stands on its own, it also serves as a natur