PS A statement of purpose CV Resume or CV Fee An application fee of $100 in the form of a credit or debit card must be submitted in tandem with your application. You may use Visa, MasterCard, American Express, or Discover when using our online application. RL Two referees willing to complete letters of recommendation are required, however a total of five may be submitted. We only accept letters of recommendation through our online system. Transcript Transcripts A bachelor’s degree or the equivalent, representing a four-year course of study in an accredited college or university, is required for admission. A master’s degree is not required, although many applicants have a master’s degree in such fields as economics, engineering, psychology, and statistics. Superior academic performance is expected. Those who hold American PhD or ScD degrees or their foreign equivalents are not normally eligible for admission. (Occasionally, an exception to this rule can be arranged.)