Students' preconceptions of the nature of gases

A total of 1098 students, from second graders to university chemistry students, drew representations of highly magnified views of air at 1.0 atmosphere of pressure and at 0.5 atmosphere of pressure. The drawings were classified and the authors inferred from them a relatively limited number of preconceptions of the nature of gases. Several major trends occurred in the frequencies of these inferred preconceptions held at different grade levels. The majority of the drawings that were not in fairly close agreement with atomic theory seemed to reflect one or more of the following misconceptions: (a) air is a continuous (nonparticulate) substance, (b) gas behavior is similar to liquid behavior, and (c) there is relatively little space between gas particles. The number of drawings that gave evidence of particulate views ranged from 8% for Grades 2–4 to 85% for university chemistry students. However, 33% of the university students' drawings showed highly packed particles, and only 37% showed particles in an approximately correct geometrical distribution. The authors suggest a technique for promoting conceptual change among students who possess alternative views of the nature of gases.     

The German dual system of initial vocational education and training and its potential for transfer to Asia

Germany has a “dual system” of initial vocational education and training, one that other countries admire and would like to adopt. Can it hand this model over to them? This article argues that doing so will require far more than a simple process of copying. Instead, any transfer must reflect the existing conditions in the country adopting the system, and must be adapted to its unique social, cultural, and economic objectives. In addition, though the dual system can serve as a model, no other country can implement the dual system as a whole, or components one by one. Instead, it must use five constitutive elements in order to transfer the dual spirit of the German model appropriately. The article ends by describing some considerations that apply to the transfer process and reviews some German projects that transferred the system to countries in Asia.     

The influence of active participation and organisation in environmental protection activities on the environmental behaviour of pupils: study of a teaching technique

Until now, many efforts in the area of environmental education, intended to instill consciously responsible behaviour into the general public in Germany, have failed. Several of the available intervention studies aimed at improving environmental behaviour of pupils with classroom tuition were able to show positive results, but there were often shortcomings in the design of these studies. First, this article presents some of these and deduces improvements and extensions for the design of the following intervention study. The described study investigated whether the active involvement and organisation in environmental activities influences the environmental behaviour of pupils. Active participation and organisation means a protection activity, designed and carried out by pupils, with help from their teacher. The results of this quantitative investigation show that the method of participation and organisation is successful and very promising. Improvements in reported and observed actual behaviour can be proved after the intervention. However, the changes are bound to the behaviour that was thematised in the teaching. The environmental perception of the pupils did not improve. Gender and the environmental perception of the pupils had no effect on the changes.