A PBIS (Positive Behavioral Intervention and Supports) Matrix is a way schools standardize their approach to school safety and positive behavior. The premise is that students can and do learn good behavior when expectations are made clear.
You have been tasked with creating a matrix for your school or institution. Keeping in mind that there is no "one size fits all" for how to manage a classroom, create a simple matrix that also allows for flexibility for learners who might have challenges (single parent, improper nutrition, learning challenges, language barriers, and so on).