An Functional Behavior Assessment, or FBA, is a document that allows Adults, Families, Teachers, and Staff to help a student figure out why they are acting a way. They are typically used when teachers and parents are seeing changes in behavior, that could be violent, to self or others, or that is not typical for the child. An FBA is is used mainly in schools for two reasons, for a student who has classified as needing special education help or for a students who has been disciplined or removed from a school building.