A field study with 16-year-old students in senior general secondary education was undertaken with the following research question: "Do students working in pairs on investigation tasks with the computer attain more conceptual level raising in mathematics when they are supported by a teacher who stimulates their interaction (process help) than when…

Focusing upon a working knowledge of ecological principles as a requisite for today's society, this teacher's guide suggests numerous field studies which make pertinent use of these principles. It is designed to serve as an aid in planning student-centered activities which allow for understanding and improving the ecosystem in which they are an…

This environmental unit is one of a series designed for integration within an existing curriculum. The unit is self-contained and requires minimal teacher preparation. The philosophy of the units is based on an experience-oriented process that encourages self-paced independent student work. In this unit, students construct a stream profile based…