This student-friendly scale will not only demonstrate a progression of learning, but also help to scaffold your unit. What will students need to know at level 1? What quick formative assessments could you do to assess at level 2? Etc.
This scale correlates to Common Core Standard CCSS.ELA-LITERACY.RL.9-10.1
Cite strong and thorough textual evidence to support analysis of what the text says explicitly as well as inferences drawn from the text.