Nurses have recently recognized the need for common language, and their attempts to develop standardized language for nursing documentation have increased. The Nursing Minimum Data Set (NMDS) was built on the concept of uniform minimum ~ata set and developed some classification systems (NANDA, Omaha System,Nursing Intervention Classification, Home Health Care Classification-HHCC) for clinical practise. It is thought that, in the 21st century the development and use of standardized language in nursing will become one of the hallmarks of profession .and marks the development of new era of nursing science inspite of some argument against using standardized language there are many reasons for use of it in nursing. it will assist the professional nurse to communicate with colleagues in her own facility and across the world. Being able to clearly articulate what it is nurses do makes visible what previously has been invisible about nursing. When nurses use standardized language to document the care they give, they can build large databases , which will articulate with those of other health providers , that can be used to demonstrate the effectiveness of nursing care. According to the nursing authors, it is important to make the systems applicable to nursing practice everywhere. Feedback is urgently needed from associations and nursing in all settings in all country. In this article, thenursing classification systems are summarized and the importance for nursing is discussed.