Like a conventional doctor, dentist or chiropractor, the Naturopathic doctor first completes pre-medical studies at university. Then he or she attends a four year, full-time program in Naturopathic medicine at an accredited naturopathic college. The first two years of study focus on basic medical sciences and diagnosis. The last two years concentrate on naturopathic principles and therapeutics, including extensive clinical practice in a supervised teaching clinic. After completion of the program, two sets of rigorous standardized NPLEX exams must be passed.