The present dissertation is a synthesis and meta-analysis of the 15-year-old research domain of the L2 Motivational Self System (L2MSS) model initiated by Dornyei (2005). The study is based on data from 100 studies involving 144 unique samples and 51,905 participants, and it addresses the inter-relationships of L2MSS elements (i.e., the Ideal L2…

The purpose of this meta-analysis was to investigate the effectiveness of the use of games as part of mathematics instruction on academic achievement in grades Kindergarten to 12 in the United States. There were 17 studies selected for investigation published from 2010 to 2023 that focused on game-based learning and mathematics. This meta-analysis…

This meta-analysis synthesized research on gender gap in the Force Concept Inventory (FCI). The main goal of the present meta-analysis was to identify the moderator variables that mediate effect size differences. Furthermore, the statistical significance of the average effect sizes was investigated. The inclusion criteria for the meta-analysis…

Despite decades of research supporting family engagement's benefits on children's social, emotional, behavioral, and academic development (Hill & Tyson, 2009; Jeynes, 2012; Patall et al., 2010; Sheridan et al., 2010), teachers are not always adequately prepared to work with families (Chavkin & Williams, 1988; Epstein & Sanders, 2006;…

This dissertation presents the results of a meta-analysis of the empirical literature on delinquent behavior among children with learning disabilities in comparison to their non-learning disabled peers. Twenty-four studies met inclusion criteria and results indicated that children with learning disabilities (n = 3,202) have higher mean scores on…

This research examined teachers' perceptions of effective leadership skills and any significant differences of teachers' views of an administrator's success based on the leader's gender. A review of studies examining differences in the leadership behaviors of men and women did not provide conclusive results. The three hypotheses based on the…

The purpose of this study was to determine the perceptions of building principals toward superintendent leadership responsibilities and practices of goal setting, nonnegotiable goals for achievement and instruction, board alignment with support of district goals, monitoring goals for achievement and instruction, use of resources to support the…