Serious games have become increasingly available to educators. Empirical studies and meta-analyses have examined their impact on learning achievement. However, natural sciences could have a special relation to serious games by their systematic use of quantitative and predictive models that can generate microworlds and simulations. Since no known…

Describes how principals assign teachers and students to single-grade and combination classes. Presents research showing unexpected constraints that fundamentally changed the basis of class assignment and, consequently, the nature of classroom compositions. A case is made that multitrack calendars reduce principals' flexibility to make purposive…

In recent years, there has been a rapid growth of interest in Sweden in vertically integrated classes in compulsory schools, especially at junior high school and intermediate grade levels. This development is supported in various ways by the curriculum, partly because it puts more emphasis than previous curricula on the occurrence of teaching…