“…Of the six theoretical/conceptual articles, three reports contained conceptual frameworks of the effects of school psychological services (Bradley-Johnson and Dean, 2000;Strein et al, 2003;Hughes and Theodore, 2009), two articles recommended methodological proposals to assess effects of services (Durlak, 2002;Morrison, 2013), and one critically discussed possible positive and negative effects of school psychological services (Nicholson et al, 2009). Within the category meta-analyses, three reports summarized effect sizes of 17 (Prout and Prout, 1998) and 65 empirical group studies (Reese et al, 2010) and five single-subject-design studies (Boudreau et al, 2015) on direct school-based psychological services respectively and one investigated the overall effect of 35 studies on indirect services (Reddy et al, 2000).…”