Nov 21, 2024  
2024-2025 Graduate Catalog 
    
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2024-2025 Graduate Catalog

Computer Science, Ph.D.

Students receiving a Ph.D. in computer science are expected to achieve and demonstrate a mastery of the discipline and to significantly advance the state of knowledge through an original research effort.

Admission Requirements

Applicants are required to satisfy the following:

  1. (a) An M.S. degree in computer science or a related field, including computer engineering, electrical engineering, mathematics or physics, from a U.S. college or university accredited by a regional accrediting association, or completion of an international degree that is equivalent to a U.S. master’s degree from a college or university of recognized standing.

    (b) In the case of direct admission without a previous M.S. degree, the baccalaureate degree in computer science or a related field must be conferred prior to the time the student begins classes as a graduate student.

  2. (a) Excellent academic performance in all completed coursework, with a GPA of at least 3.000 on a 4.000 scale in the student’s baccalaureate coursework and master’s coursework

    (b) In the case of direct admission without a previous M.S. degree, the student’s GPA must be at least 3.400 on a 4.000 scale in the student’s junior and senior years.

  3. A reasonable level of mathematical maturity.
  4. Submission of a complete application, including a statement of purpose, official transcripts for all previous undergraduate and graduate studies and payment of appropriate application fee.
  5. Submission of official GRE graduate school admission test scores.
  6. Three letters of recommendation from individuals who can judge the applicant’s potential success as a doctoral student.
  7. Submission of a notarized financial certification form (graduates from foreign countries only). Before being considered for admission, all international students whose native language is not English and who have not graduated from an American university must submit a minimum TOEFL English language proficiency exam score as follows:
  • 550 - paper-based examination.
  • 213 - computer-based examination.
  • 80 - Internet-based examination.
  • ​A score of 6.5 on the IELTS English language proficiency examination is acceptable in place of the above scores for the TOEFL examination.

Direct Admission into the Ph.D. Program

The Computer Science Department offers direct admission to the Ph.D. program for highly qualified students having a bachelor’s degree in computer science or a related degree. The combined minimum number of course and dissertation credits for the Ph.D. degree is 78 credits beyond the bachelor’s degree. A student directly admitted with a bachelor’s degree in computer science or related degree must successfully complete a minimum of 36 credit hours of coursework and a minimum of 24 credit hours of dissertation with the total coursework and dissertation hours reaching a minimum of 78 credit hours. The most common program of study would be for a student to take 36 credit hours of course work and 42 credits of dissertation.

Degree Requirements

In addition to meeting the Lyle School of Engineering requirements for the Ph.D. degree, candidates are required to satisfy the following:

  1. The graduation requirements fall into the categories of completion of a specified number of graduate credit hours in appropriate subjects with an acceptable GPA, demonstration of understanding of the discipline of computer science as evidenced by examination, and completion of a substantial research effort documented in a doctoral dissertation. Doctoral students must maintain at least a 3.000 GPA every term and at least a 3.300 overall (cumulative) GPA during their course of study.
  2. All requirements must be completed within seven years of entry into the program.

The steps for completion of the doctoral program are:

  1. Initial advising.
  2. Basic coursework to prepare for the commencement of research work.
  3. Selection of a dissertation director and advising committee.
  4. Advanced coursework in the chosen research area and guided thesis research to prepare for the qualifying examination.
  5. Successful completion of the qualifying examination as determined by the doctoral advising committee.
  6. Dissertation research supervised by the candidate’s doctoral adviser.
  7. Successful defense of the research leading to the Ph.D.

Any deviation from the stated requirements must be approved in writing from the student’s adviser and department chair.

Initial Advising

Upon entry into the Ph.D. program, students are assigned a faculty adviser who acts as an academic adviser. The responsibilities of this adviser are to examine the student’s prior background and current state of knowledge and to recommend courses to be taken in preparation for conducting research.

Credit Requirements

Graduate Credit Hours

For a student admitted with a master’s degree, a minimum of 54 graduate credit hours of coursework is required beyond the baccalaureate degree in order to achieve the Ph.D. degree. In addition to these 54 credit hours of coursework, 24 credit hours are required for dissertation credit with the total coursework and dissertation hours reaching a minimum of 78 credit hours. Of the 54 graduate credit hours of coursework, a maximum of 30 credit hours may be transferred if an entering student possesses an M.S. in an appropriate major from another institution. 

Core Courses

Students must select four core courses from the following list. If a student has already received credit for any of these courses (or their equivalent at another university), this will count towards the core course requirement.

Minor Requirement

A minor with a minimum of 12 credit hours supporting the chosen research area is required. These courses may be taken in CS or in another department in the Lyle School of Engineering. The minor requirement may be satisfied by transfer credit.

Seminar Requirement

All full-time Ph.D. students are required to enroll in the CS seminar class CS 8098  at least one time, preferably in their first year as a Ph.D. student. The CS 8098  course is graded on a pass/fail basis.

Grades

No graduate credit is earned for a course in which a grade of less than C- is received. Such courses do, however, count toward the total GPA. A student must have a GPA of at least 3.000 on a 4.000 scale to graduate. If at any point, a student’s GPA drops below 3.000, the student is placed on academic probation. The student then has one term to raise their GPA to 3.000 or be dismissed from the program. For part-time students, one term is taken to mean six credit hours. A grade of I (Incomplete) affects the GPA for the term in which the grade is granted rather than when it is removed; therefore, a student is placed on academic probation if they are granted a grade of I on currently completed work in the course and that grade causes the student’s GPA to drop below 3.000.

Advanced Study

Advanced study in computer science consists of a major concentration area. A concentration area consists of a number of courses that are related to a specific subfield of computer science. The major concentration consists of a minimum of 18 credit hours, no more than six of which can be independent study.

Credit earned for the core courses (CS 7330 , CS 7343 , CS 7350  and CS 7381 ) will not be counted for the concentration area. The student must file an advanced study degree plan with the department. No degree plan is accepted until approved by the chair of CS. Credits received prior to filing a degree plan are not guaranteed to count toward graduation.

Research Adviser and Supervisory Committee

Before the student has completed 18 credit hours or two years of Ph.D. study (whichever comes first), they must identify a dissertation director and form a supervisory committee. It is the responsibility of the student to find a faculty member willing to provide a research topic or to supervise a topic of the student’s choosing. The dissertation director must be one of the full-time tenure or tenure-track faculty members of the CS Department. This requirement will be satisfied by successful completion and filing of the Recommendation and Certification of Appointment of Supervisory Committee form.

The dissertation director, together with the student, should prepare the advanced study degree plan. They should also form the supervisory committee. The supervisory committee is made up of at least five members. Three resident tenured or tenure-track faculty members are drawn from the student’s department, and one resident tenured or tenure-track faculty member is chosen from each minor field. The chair of the supervisory committee shall be a resident tenured or tenure-track member of the school faculty and shall normally be the dissertation director and a member of the student’s department. Thus, a minimum of four members must be resident tenured or tenure-track faculty of SMU. The names of the supervisory committee members must be submitted to the chair of the CS Department and the director of the graduate division for approval.

Qualifying Examination

The student must complete all the core courses with an average grade of B+ (3.300) or better before they can appear for the qualifying examination. The student will give a written proposal to the committee members. The timing of this submission will be determined by the thesis adviser and usually occurs at the 40–50 percent completion point of the thesis research.

Committee members will submit questions to the Ph.D. dissertation director. The director and the members will negotiate the content of the questions. The questions will generally be from areas related to the student’s area of research and, hence, the questions will be submitted only after the student has submitted the written proposal. However, should a majority of the committee judge that the student has not shown strong credentials in one or more of the core areas, the examination may include questions designed specifically to determine whether or not the student has sufficient background in those areas. Examinations will be graded by each submitting member and given back to the chair. The chair, along with the other members, will decide the outcome (pass/fail) of the examination.

The written portion of the qualifying examination is a take-home (open-book) examination with four questions. Although there will be more than four members in the committee, usually one member will be from outside CS and will not be required to submit a question. The questions will be given to the students on a Friday as determined by the committee chair, and the answers will be due back on the following Friday. The student must attain an average score of 70 percent and a minimum score of 50 percent on each individual question in order to receive a passing grade.

After passing the written portion, the student will appear for the oral portion of the qualifying examination. In addition to evaluating the presentation based on the proposed research, the oral part will also address any deficiencies the written examination may reveal. The student should schedule the oral presentation at the time the written proposal is submitted, even though they will be eligible to appear for the oral presentation only after passing the written portion.

Students will have a maximum of two attempts to pass the qualifying examination.

If a student changes her or his area of research significantly or if significant changes are made to the composition of the supervising committee, the student may be required to repeat the qualifying examination.

Change of Committee or Concentration

A student may change concentration, dissertation director or supervisory committee at any point, subject to the approval of the CS faculty. Such a change will generally require the formation of a new supervisory committee and will definitely require the filing of a new advanced study plan. The student must take a qualifying examination in the new concentration area to be admitted to candidacy. In the event that the student changes concentration after being admitted to candidacy, the candidacy is revoked and the student must pass the qualifying examination in the new concentration. Two attempts are allowed for a student in this position. A student may also change areas before being admitted to candidacy. In this event, it is possible that one or more unsuccessful attempts will have been made to pass the qualifying examination. The student may, at the discretion of the CS supervisory committee be allowed two attempts in the new concentration, but under no circumstances will more than three attempts be allowed at the examination. It is also possible that a student will change dissertation director or composition of the supervisory committee while still retaining the same concentration area. Such changes may be made only with the approval of the CS supervisory committee. If the dissertation director is changed, the new dissertation director may, at their discretion, require a new qualifying examination. In addition, if the makeup of the supervisory committee changes substantially, the CS supervisory committee may require a new qualifying examination to be taken with the newly constituted committee.

Doctoral Dissertation

The most clearly distinguishing characteristic of a program leading to the Ph.D. degree is the requirement that the candidate write a dissertation embodying the results of a significant and original investigation. The dissertation must make a contribution to knowledge that is of value to the computer science discipline, and it is expected to be a mature and competent piece of writing. The work reported in the dissertation may be basic scientific research, engineering research or creative design.

Upon the successful completion of the dissertation defense, the dissertation is electronically uploaded to the SMU/UMI Dissertation Publishing submission website. The original abstract must be signed by the dissertation director, and the original half-title page of the dissertation must be signed by all of the CS faculty members attending the dissertation defense.

Dissertation Defense

Final Examination:

Upon completion of all other requirements, a dissertation defense by the candidate will be announced, registered with the Graduate Division and subsequently conducted by the supervisory committee. The candidate must make six unbound copies of their dissertation available to the members of the supervisory committee at least two weeks in advance of the dissertation defense. This defense, which is conducted orally, must enable the supervisory committee to satisfy itself that the dissertation is an original piece of work, either in research or creative design that it has been carried out in keeping with the highest standards of investigation and reporting, and that it makes a contribution to knowledge that is of value to the computer profession or scientific community. The defense must be scheduled with the CS departmental office and posted in the Lyle School of Engineering. This defense is open to the public, with the possible exception of a period open only to committee members and CS faculty in which general questions in computer science may be asked. Satisfactory performance on this defense constitutes the last requirement to be met for the Ph.D. degree.