Collecting and analyzing metrics is critical to objectively identifying and quantifying process improvements. Technical controlling of software projects is introduced as a comprehensive controlling activity concerned with identifying, measuring, accumulating, analyzing and interpreting project information for strategy formulation, planning and tracking activities, decision-making, and cost accounting. Progress metrics are particularly relevant for having insight into projects and at the same time into process improvements. This article focuses on introducing and maintaining a corporate program for technical controlling in a highly distributed large organization. Experiences are shared that show how technical controlling closely relates and thus supports an ongoing software process improvement initiative. Results from Alcatel Telecom's Switching System Division are included to show practical impacts.