A Snapshot of the PBiS 4:1 Ratio In a High School Classroom 

Biology Teacher, Heidi Swetnam, demonstrates how she uses the PBiS (Positive Behavioral Interventions and Supports) 4:1 ratio strategy to promote a positive classroom learning environment. Watch as a tally keeps track of her use of positive acknowledgements verses corrective statements during a ninth grade biology lesson on DNA replication.