Improving business processes is a key success factor for organizations and, at the same time, a major challenge for decision makers. For process improvement to be successful, effective prioritization is essential. Despite the existence of approaches for the prioritization of process improvement projects or business processes, prescriptive research at the intersection of both research streams is missing. Existing approaches do not simultaneously prioritize business processes and improvement projects. Hence, scarce corporate funds may be misallocated. To address this research gap, we propose the PMP2, an economic decision model that assists organizations in the identification of business process improvement (BPI) roadmaps. Based on stochastic processes and simulation, the decision model maps different improvement projects to individual business processes within a process network. Thereby, it caters for process dependencies and basic interactions among projects. Drawing from the principles of value-based management, the decision model determines the process improvement roadmap with the highest contribution to the long-term firm value. To evaluate the PMP2, we instantiated it as a software prototype and performed different scenario analyses based on synthetic data. The results highlight the importance of prioritizing business processes and improvement projects in an integrated manner.