The aim of this longitudinal research is to examine the development process of scientific and consistent knowledge structures of first, second, and third-grade students in middle school within the concepts of melting and dissolution according to conceptual change theories at the end of the education and training processes carried out in…

In this study we use data from the Programme for International Student Assessment (PISA) to investigate the effect of teachers' motivation on students' scientific literacy and motivation in Colombia. These relationships are explored using a multilevel modeling framework and through the lens of Self-Determination Theory. Although difficulties in…