Individuals who hold either a bachelor's degree, Licentiate or Technologist are eligible for admission into graduate courses leading to advanced master's or doctor's degrees. Criteria for admission into master's and doctor's programs vary in Brazil. Some universities require that candidates take entrance exams; others make admission decisions based solely on undergraduate transcripts, letters of recommendation and possibly oral interviews. In most cases, however, especially for the doctorate, the candidate is required to submit a research plan and one faculty member must agree to serve as his/her supervisor before the candidate can be admitted into the program; The exception are the Natural Sciences post-graduate programs, that accepts students with very broad and/or vague research prospects with sometimes the prospect is given "in promptu" during the interview, preferring to let the students define their study program and advisor in the course of the first year of studies.