To identify variables influencing the acquisition of teaching skills, 26 studies addressing the acquisition of the generic skill of questioning were synthesized through meta-analysis. The training variables considered include general effect, method, duration, number of sessions, experience and academic certification levels of trainees, and…

Meta analysis techniques were used to synthesize research on teaching students how to control variables when designing an experiment. The review included 65 controlled studies. Findings are reported in terms of the influence on effect sizes of characteristics of the study, instruments used, treatments applied, and results' utilities. (SLD)