Students' ability to apply their knowledge and reason from science instruction in Zimbabwe

The goal of this research was to investigate the knowledge high school students acquire from science instruction in Zimbabwe, and their ability to reason from and apply their knowledge based on previous learning. Science educators in Zimbabwe are concerned with improving the quality of student's achievement and that students develop a conceptual understanding of basic science rather than a rote memorisation of facts and that students become better prepared to acquire science content on their own. The research reported here utilises the discourse comprehension analysis model and methods developed by Frederiksen (1975, 1986) to investigate students' learning. Based on these methods, it is possible to examine: (a) how students acquire knowledge and understanding, and (b) how they apply what they learn to reason using their conceptual knowledge.The design of the study involved the use of three texts each of which represented different information types within a science domain, 'gas pressure'. The content of the texts was presented by the same teacher during natural classroom instruction to classes at two levels (higher and lower) of a high school grade. The first text concerned Basic Knowledge (concepts and principles) in the domain, and the second and third texts described Familiar and Unfamiliar experiments respectively within the same science domain. In addition, for both of these experiments, several types of information were presented: Procedures, Observations and Explanations. Students' responses to comprehension questions were subjected to a conceptual (propositional) analysis and coded against an 'expert' model of the content of the texts used by the teacher during instruction to the students. The study focused on identifying the extent to which the students' responses directly matched the 'expert' model or consisted of modifications (inferences) that indicated alternative (true or false) conceptual knowledge frameworks that the students may have possessed.The major findings of this research were as follows: Students' answers to questions about their knowledge of basic concepts comprised a large number of responses that directly matched (i.e., literally recalled) the information presented by the teacher during instruction and also included a high number of incorrect inferences. Students' comprehension of the Familiar and Unfamiliar experiments was also characterised by a high degree of 'literal learning' as shown in the generally high amounts of recall of propositional information compared to inferences. Students' responses to these questions consisted mostly of Observation information, and least of Explanations. This suggests that they were more likely to recall observed events that they were to interpret. Students' reasoning was generally poor relative to their comprehension of both experiments, and their responses consisted of more recall responses than inferences. In addition, students' reasoning about the Unfamiliar experiment was characterised by a high number negative higher-order inferences. Finally, students in the higher level displayed higher levels of competence than those in the lower level, particularly in their knowledge of Procedures and Observations in contrast to Explanation information, for both experiments