This is a cross-sectional, longitudinal and comparative study designed to generate descriptive [observational] and causal [quasi-experimental] evidence. Original data are collected using diaries or journals kept by study subjects, school records or policy documents, assessments of learning or achievement tests, observation [personal], survey research [computer assisted personal interviews and face-to-face interviews], imaging, and chronometric studies of reaction times involving number decisions.
Dependent measures are analyzed primarily through a General Linear Model approach, including repeated measures ANOVA (mixed model), correlation, and multiple regression.
