In the early 2000s, a web-based application called “Zooming in on Teaching Expertise” has been developed (http://zoom.animare.org). Its goal was to support Quebec teachers embrace the pedagogical renewal that started in 2001 (Gouvernement du Québec, 2001) by proposing new training strategies based primarily on the observation and analysis of filmed practices, along with a variety of tools aimed at stimulating reflection on the teaching practice itself. A study was completed in 2010 in which the objective was to evaluate the effect of this web-based teacher professional development application. More precisely, our aim was to evaluate the effect of a training course entailing examples of practice on video and created within the application. We based our work on a model developed by Charlier (1998). We adapted this model to our research and have chosen to focus our attention on three distinct elements: learning, intentions to change classroom practice and representation of the effectiveness of training. Our presentation will focus on what we observed and on the main results we obtained. We will also put these findings into perspective considering recent research done in that field and propose some avenues of research (Colestock & Sherin, 2009; Santagata, 2009; van Es, 2009).