We propose a tool developed in Pharo Smalltalk ( http://www.pharo-project.org ) to support integrators in taking decisions about the integration of changes before performing the actual merging, and to support developers to understand and control their changes before publishing them. Torch is a software visualization tool that provides an overview of how a Smalltalk program was changed, and that aims at aiding its user in understanding these changes. Torch characterizes the changes based on structural information, authors and symbolic information. It offers a dashboard that presents different structural representations of changes using visualizations. We have integrated Torch with the Monticello versioning system.