With the launch of a voluntary national accreditation program for public health agencies, the field requires an expanding evidence base concerning which public health strategies work best, for which populations, and under what circumstances. The field of public health services and systems research (PHSSR) and practice-based research networks (PBRNs) are producing applied studies that can inform the future development and implementation of accreditation standards, and evaluate the impact of accreditation on the field of practice.