This supplement to the Clinical Journal of Oncology Nursing (CJON) marks a significant milestone in the sustained efforts of the Oncology Nursing Society (ONS) to improve the quality of cancer care—a core component of the ONS mission. The lead article by Fessele, Yendro, and Mallory on pages 7-11 of this supplement summarizes the ONS Foundation-supported Breast Cancer Care (BCC) and Breast Cancer Survivorship (BCS) Quality Measures project. ONS leaders recognized that efforts to improve performance and patient outcomes were limited by the lack of a core set of reliable and valid patient-centered measures. A grant from the Breast Cancer Fund of the National Philanthropic Trust to the ONS Foundation supported a partnership with the Joint Commission and the development of two sets of measures for patients with breast cancer. These patient-centered measures span the treatment and the survivorship phases of cancer care, and are sensitive to nursing practice. This pioneering work is a direct outcome of ONS's strategic initiatives related to quality and builds on the extensive foundation for promoting evidence-based practice through the Putting Evidence Into Practice (PEP) initiative.