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Joaquín Cañero-Arias; Ángel Blanco-López; José María Oliva – International Journal of Science Education, 2024
This research integrates context-based learning and modelling. It presents a teaching-learning sequence (TLS) about the dissolution of gases in liquids using carbonated drinks as the context. The impact of the TLS is analysed in a longitudinal short-term study involving two groups of learners aged 13-14 years old (n=53). The results led us to…
Descriptors: Foreign Countries, Science Instruction, Models, Secondary School Science
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Fraser, Mark W.; Galinsky, Maeda J. – Research on Social Work Practice, 2010
This article describes a 5-step model of intervention research. From lessons learned in our work, we develop an outline of core activities in designing and developing social programs. These include (a) develop problem and program theories; (b) design program materials and measures; (c) confirm and refine program components in efficacy tests; (d)…
Descriptors: Intervention, Program Development, Program Design, Models
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Bauer, Daniel J.; Preacher, Kristopher J.; Gil, Karen M. – Psychological Methods, 2006
The authors propose new procedures for evaluating direct, indirect, and total effects in multilevel models when all relevant variables are measured at Level 1 and all effects are random. Formulas are provided for the mean and variance of the indirect and total effects and for the sampling variances of the average indirect and total effects.…
Descriptors: Testing, Models, Sampling, Context Effect