“…The different relation between the BSOS and mother and teacher reports of externalizing behaviour problems may relate to research indicating that parent reports of child behaviour problems frequently differ from those of other observers (Clarke-Stewart, Allhusen, McDowell, Thelen, & Call, 2003;de la Barra, Toledo, & Rodriguez, 2005;Doctoroff & Arnold, 2004;Fagot & Leve, 1998). This may due to factors such as measurement error, rater variance or the different environments in which different raters see the child behave (Greenbaum, Dedrick, Prange, & Friedman, 1994).…”