Comparative studies in content and language integrated learning (CLIL) often show CLIL students to be at something of an advantage over their non-CLIL peers. However, such studies are often difficult to interpret given problems of cross-group comparability (different schooling systems, different number of instructional hours, bias attributable to…

Contrasts data gathered regarding how textbooks deal with natural selection and teacher's ability to explore pupils' ideas related to it with an approach seeking to develop the pupils' capacity to explain biological change using the model of natural selection. Results show the approach is often characterized by superficial handling of key ideas…