Elementary school teachers' implementation of dynamic geometry using model lesson videos

In this study, a set of activities on line symmetry in a Web Sketchpad environment, published on the website of a Canadian university, were adapted by two Italian researchers for 1st and 2nd grades with an Interactive White Board in the classroom. The activities were proposed to a 2nd grade during two video-recorded lessons conducted by one of the researchers. The videos were viewed by three teachers who then proposed the same activities in their 1st and 2nd grade classes. The study was carried out over a 6-month period. One of its aims, the main focus of this paper, was the following: to study teachers’ implementation of the activities and to identify aspects of the study’s teacher instructional improvement cycle that were most influential in their implementations of the technology-based activities.