Ph.D. in a related field, or Master's in a related field with several years of relevant experience, or Bachelor's in a related field with more than five years of experience. In the absence of a formal degree, considerable equivalent work experience is required. Successful candidates will have demonstrated the technical skill, motivation, independence, and creativity necessary to complete difficult tasks.
While there is no appropriate time limit for appointment at this rank, exceptional individuals will be promoted. Candidates should develop a mastery of specialized techniques or ingenuity and creativity in selecting and evaluating approaches to problems. They should develop the ability to apply an analytical approach to solutions and to assimilate the details and significance of various analyses, procedures, and tests prior to being considered for promotion.