This study investigates the impact of the Lesson Analysis Framework (LAF) on preservice teachers’ abilities to analyze lessons through an experimental design. The intervention was implemented as part of a course in the teacher preparation program for secondary teaching at a large public university in Italy. The participants were randomly assigned to LAF group and Teaching Rating Framework (TRF) group. The findings revealed that participants who used the LAF as a lens for reflecting on a videotaped lesson during an intervention improved their unprompted analysis of a novel lesson after the intervention, whereas the reflections of participants who used an alternative framework, the TRF, did not change over time.