To obtain a Bachelor of Science in Nursing (BSN), a four-year degree prepares nurses for graduate-level education. For the first two years in a BSN program, students usually obtain general education requirements and spend the remaining time in nursing courses. The Bachelor of Science in Nursing degrees have many courses which stretches out the degree-acquiring process to over 4 years. Advocates for the ADN and diploma programs state that such programs have a on the job training approach to educating students, while the BSN is an academic degree that emphasizes research and nursing theory. However the BSN graduate has both more classroom and clinical hours of study in nursing than the ADN graduate. The BSN graduate is professionally degreed; and as such is called a professional nurse. However, some states require a specific amount of clinical experience that is the same for both BSN and ADN students. Nursing schools may or may not be accredited by either the National League for Nursing Accrediting Commission (NLNAC) or the Commission on Collegiate Nursing Education (CCNE).  Wikipaedia.org