Comprehensive implementation of reporting and learning systems (RLS, also known as incident reporting systems) is important for its successful use as a patient safety improvement tool. This study aimed to develop a set of “implementation patient safety indicator(s) sets” to monitor the extent to which an RLS has been implemented in hospitals. Implementation outcomes include acceptability, adoption, appropriateness, implementation costs, feasibility, fidelity, penetration, and sustainability. Study participants rated acceptability and sustainability as most relevant to successful implementation.