An acceptable dissertation must be submitted within five years of the date of matriculation as a full-time (seven years for part-time candidates) doctoral candidate. At the end of the five years, students who have not completed their dissertation will be reviewed by the CAD for unsatisfactory progress. Extensions of time beyond five years are considered only upon special petition and explanation. Generally, the dissertation is published as a series of papers. Occasionally it becomes apparent that publication of the dissertation work as a series of papers is not feasible. Students, in conjunction with the Research Committee, must, at an early stage of the work, request permission from the CAD to submit a traditional dissertation rather than one or more papers.