This paper presents the design, features and pilot evaluation study of a web-based environment--the SORTING environment--for the learning of sorting algorithms by secondary level education students. The design of this environment is based on modeling methodology, taking into account modern constructivist and social theories of learning while at…

Describes a computer microworld for learning the concept of conservation of area and its measurement; analyzes its main features (drawing segments and polygons, manipulation of areas using simulations of children's sensory-motor actions, measuring areas, transforming areas into equivalent ones, and measuring lengths and angles); and presents the…