I have fully implemented NGSS into my 7th and 8th grade science curriculum. One struggle I encountered was how to teach students to model their thinking. I created this handout to teach students what physical and conceptual models are. I used this handout to lead all of my students to the deeper understanding that scientific models are used to communicate your conceptual understanding of something. If someone understandings a model, they should be able to use it to make predictions and solve problems. I am truly proud of this document. I think it should be a part of every science teachers tool bag as they begin to incorporate modeling of phenomena understanding into their classrooms. This document could also be used for professional learning as well.