The Functional Behavioural Assessment (FBA) is an investigative process that examines the context of challenging behaviours in the classroom. Information gleaned from the FBA process is used to develop a behaviour intervention plan to address the challenging behaviour and teach a socially acceptable replacement behaviour. However, the FBA has remained almost exclusively used with students identified with disabilities, particularly those with emotional/behavioural disorders (EBD) as a last resort before removal from the general school campus. Fortunately, there is a growing awareness of the FBA as positive behaviour support practice in the general education classroom to assist non-disabled students and early intervention for students with or at-risk for EBD. In this paper, we discuss the FBA, its place as a positive behaviour practice, and its application in the general education classroom to assist students who are demonstrating challenging behaviours prior to considering a referral for special education assessment. (Contains 3 figures.)