University instructors face strict economic constraints when designing lectures. Intelligent usage of IT and higher degrees of learner integration can help to face this challenge, but it is difficult to decide which parts of a lecture should be re-designed and how. Thus, we present the Didactical Service Blueprint (DSB), a method to analyze and re-design large scale learning services with reasonable resources by integrating eLearning and peer learning activities. We have used DSB to iteratively improve an ISlecture over the course of four years and evaluated learning success (n = 404) and satisfaction (n = 389). Results indicate that DSB is suitable to improve lectures considering reasonable consumption of resources. As theoretical contribution, this paper offers an advancement and adaptation of the traditional Service Blueprint explicitly designed for large scale learning services. The practical contribution lies in the application of DSB to develop solutions for common problems in large courses