Demonstration models allow students to readily grasp theory and relate difficult concepts and equations to real life. However drawbacks of using these demonstration models are that they are can be costly to purchase from vendors or take a significant amount of time to build. These two limiting factors can pose a significant obstacle for adding…

There is general agreement that the current teaching of secondary science is not as good as it should be. Different critics identify different weaknesses, but there is agreement that students are not learning how scientists make knowledge claims and use this knowledge. This paper assumes that one powerful influence on the development of teachers…