“…Beyond structural aspects of classroom contexts (e.g., class size: Biddle & Berliner, 2002; % of English language learners: Gottfried, 2014), understanding the social context of classrooms-the primary learning environment of schools-has been a central goal of research focused on promotion of academic achievement and engagement (e.g., Hamre & Pianta, 2001;Ladd, Birch & Buhs, 1999;Roorda, Koomen, Spilt & Oort, 2011). Applications of social capital and attachment theories (Coleman, 1988;Dika & Singh, 2002;Pianta, 1999) suggest that specific classroom relationships provide the resources, security, and/or motivation for students to engage in academic activities.…”