This report presents results from the second phase of a descriptive study of the Researcher-Practitioner Partnerships in Education Research program. This two-year grant program, funded by the Institute of Education Sciences (IES) at the U.S. Department of Education, supports exploratory research within a partnership context. In each funded partnership, researchers collaborate with practitioners from state or local education agencies on a research project that investigates a problem of practice and identifies strategies to address the key issues. The first three cohorts of researcher-practitioner partnerships (RPPs), funded in 2013-2015, using a mixed-methods, cross-case design. A summary of Phase I findings can be found in NCRPP Technical Report No. 2, A Descriptive Study of the IES Researcher-Practitioner Partnerships Program. For Phase II, two survey instruments, one for researchers and one for practitioners were developed. The surveys included five previously-tested scales of items from NCRPP's national survey of educational leaders' research use as well as new items related to partnership goals, prior relationships, and future work together. New items were tested and revised through a cognitive piloting process. An interview protocol for each group was also developed, pilot-tested, and implemented, as well as a systematic document review of grant applications. This report describes the instrument development process, sampling strategy, and key constructs. The report then offers analysis for questions asked about perceived benefits of partnerships, and questions asked regarding partnership contexts. Findings of this study can hopefully inform the IES RPP program, but also contribute to knowledge on the processes, successes, and challenges of RPPs in education. [For "A Descriptive Study of the IES Researcher-Practitioner Partnerships in Education Research Program: Interim Report. Technical Report No. 2", see ED599955.]