The purposes of this study were to examine the relations of both family and school contexts on students' academic achievement and to explore the mediating effects of students' perceptions of their motivations and academic self-competence between the family and school contexts and achievement. Participants were 230 fifth-and sixth-grade students. Students' perceptions of parenting style (demandingness and responsiveness), parental involvement (parental values and involvement in school functions), teaching style (teacher control and responsiveness), and school atmosphere (school responsiveness and supportive social environment) significantly predicted their school achievement; however, students' motivations and self-competence mediated the relations between students' contexts and their academic achievement. Furthermore, parental values, teacher responsiveness, school responsiveness, and supportive social environment predicted students' motivations and academic competence above and beyond parenting style, parental involvement, and teacher control. The importance of students' supportive relationships and the internalization of the messages conveyed to them underscore the need for a contextual view by school psychologists when consulting with parents and education staff regarding achievement concerns. © 2001 John Wiley & Sons, Inc. Over the past 20 years, researchers have made considerable advances in their understanding of the contextual factors that influence children's school achievement; yet, that knowledge is only recently influencing psychological practice in the schools. Individual influences of parent, teacher, and school factors on achievement are well documented in the educational and developmental literature (Eccles, Wigfield, & Schiefele, 1998;Steinberg, 2000): students' school achievement is related to their perceptions of parenting style and parental involvement (e.g., Carlson, 1990;Dornbusch, Ritter, Leiderman, Roberts, & Fraleigh, 1987;Grolnick & Ryan, 1989;Paulson, 1994;Stevenson & Baker, 1987;Wentzel, 1994), to teaching style and the classroom environment (e.g., Goodenow, 1993;Ryan & Grolnick, 1986;Rutter, 1983;Wentzel, 1997), and to school climate (e.g., Epstein & McPartland, 1976;Roeser, Midgley, & Maehr, 1994). However, an ecological perspective of child development (Bronfenbrenner, 1979(Bronfenbrenner, , 1986 would suggest that understanding children's perceptions of any single context is not sufficient for understanding children's performance in school. Despite continued suggestions to study the influence of the combination of contextual factors (Anderman & Anderman, 2000;Bronfenbrenner & Crouter, 1983;Epstein, 1983;Steinberg, 2000), few multicontextual studies of children's achievement have been conducted. Microsystem models (see Bronfenbrenner & Crouter, 1983 for a description of ecological models of research) are used most frequently in establishing the relations of any given context (family, classroom, or school) with children's achievement. However, mesosystem models, defined as "one tha...