“…The externalizing construct refers to the outward expression of harmful behaviours (e.g., aggression, hyperactivity, defiance) that affect the external environment. Due to the observable dysregulated emotional states and related conflict that ensues, externalizing symptoms are often referred to as behaviour problems by professionals working with children and youth (Lane, Oakes, Carter, Lambert, & Jenkins, 2013;Liu, 2004;Mikolajewski, Allan, Hart, Lonigan, & Taylor, 2013). In the American Psychiatric Association's (2013) Diagnostic and Statistical Manual of Mental Disorders (DSM-5), the clusters of externalizing symptoms are commonly categorized as oppositional defiant disorder (ODD), conduct disorder (CD), and attention-deficit hyperactivity disorder (ADHD).…”