Prior to the application of the AACN Synergy Model for Patient Care framework to the CCRN certification program, the examination was solely based on the Clinical Judgment facet of critical care nursing practice. In recognition of the additional components that comprise critical care nursing, as of July 1, 1999, twenty percent (20%) of the CCRN examination is based on Advocacy/Moral Agency, Caring Practices, Collaboration, Systems Thinking, Response to Diversity, Clinical Inquiry, and Facilitation of Learning. These nursing characteristics are referred to collectively as Professional Caring and Ethical Practice; for further information, please refer to the AACN Synergy Model for Patient Care.