Washington State Special Education Rules (the WACs):
https://apps.leg.wa.gov/WAC/default.aspx?cite=392-172A&full=true
OSPI (Office of Superintendent of Public Instruction):
Guidance for Families re Behavior and Discipline:
Model State Forms for Special Education, including FBAs and BIPs:
U.S. Department of Education Dear Colleague Letter
Positive Behavioral Interventions and Supports in IEPs, August 1, 2016:
https://www2.ed.gov/policy/gen/guid/school-discipline/files/dcl-on-pbis-in-ieps--08-01-2016.pdf