Next in the series of Powerful Graphic Organizers for STEM is Claim, Evidence, Reasoning. This concept, although it seems pretty straight forward, is one of the most difficult for students.
In the CER model, students seem to struggle most with what kind of information to write in each category. Having students write their responses in this format ensures that they are: choosing a side or solution to support, providing evidence and support for their side/solution, and (the hard part) providing a sort of conclusion by tying their claim and evidence to a scientific phenomena.
Providing this framework in the form of a graphic organizer seems to help visually break down each component thus making it easier for students to make a claim and properly support it.