How are nursing diagnoses listed, arranged, or classified? In 2002, Taxonomy II was adopted, which was based on the Functional Health Patterns assessment framework of Dr. Mary Joy Gordon. Taxonomy II has three levels: Domains (13), Classes (47), and nursing diagnoses. Nursing diagnoses are no longer grouped by Gordon’s patterns but coded according to seven axes: diagnostic concept, time, unit of care, age, health status, descriptor, and topology. In addition, diagnoses are now listed alphabetically by their concept, not by the first word.