Multiple nurse-physician (RNMD) relationships coexist on hospital units; collegial and collaborative (C/C) relationships positively impact, more than others, patient outcomes. The goal of this multisite evidence-based management practice initiative was to identify structures that enable C/C RNMD relationships. In part 1, the authors discuss the methodology and selection of the sample of 141 physicians, managers, and staff nurses from 44 clinical units in 5 hospitals that had previously demonstrated extensive C/C RNMD relationships. These 141 experts were interviewed to identify structures enabling C/C RNMD relationships. Part 1 presents the structures that enable C/C RNMD relationships as described and tested in the literature, as well as a description of the characteristics of the clinical units, experts, and C/C RNMD relationships found in this study. In part 2, the structures identified by the experts as needed for securing C/C RNMD relationships will be presented, along with suggestions for attainment.