Diverse data and information are becoming increasingly important to clinicians, administrators, and educators as they work in rapidly changing settings. A number of classification systems or vocabularies have been developed that offer structure for client records and clinical information systems. Such structure is needed to generate reliable, valid, and useful data. The research-based Omaha System is one such classification system. It consists of nursing diagnoses/client problems, interventions, and client outcomes. The Omaha System is being used in many settings, including home care, nursing centers, colleges of nursing, and school health programs.