The article addresses the effects of the intervention on pre-service teachers’ awarenessof the complexity of teaching. The authors designed one semester-long intervention course for pre-service teachers, based on an Internet site, including video-recorded authentic classroom literature teaching situations, transcripts of these lessons and diverse tasks. An analysis of the data revealed the pre-service teachers’ learning processes as they unfolded along the course: growing awareness of the complexity of classroom teaching, ability to base the analysis of the episodes on theories, and the initial construction of a cognitive lens to view classroom processes holistically.