For presentation purposes, the PhD program requirements are divided into general requirements that are applicable throughout the program and milestones that must be fulfilled during the program.
General Requirements:
Directed Research
The primary focus of the PhD program is research, with the philosophy that students learn best by doing - beginning as apprentices and becoming junior colleagues working with faculty on scholarly research projects. All students spend at least half-time effort on research, usually under the direction of their advisor(s). Students are expected to participate in departmental and laboratory activities full-time on-campus throughout the program, except possibly for summer internships elsewhere. Therefore the department does not consider the admission of part-time students. Study for the MPhil, a GSAS prerequisite for the PhD, is full-time only.
Advisor
Every student must have an advisor throughout the program. Most students arrange a research advisor (who will in most cases later become the thesis advisor) during the admissions process prior to enrollment, and work closely with him or her on directed research from their first day in the program. A few students are assigned only a nominal departmental advisor initially, and then arrange a research advisor during their first year, normally by the end of their first semester. Some students have two joint advisors.
Community Service
The Department of Computer Science takes pride in maintaining a well-developed sense of community, and sees as an essential part of its PhD degree program the preparation of its students for this important aspect of their future careers. It therefore strongly encourages its students through their advisors to contribute a year of service to the department's professional, operational or social needs, preferably in their first two years in the program. A list of community service positions normally held by PhD students is available in mice.
Milestones:
English Proficiency
A score of "level 10" on the English Certification Test (ECT) offered by Columbia’s American Language Program (ALP) is required for any foreign student whose undergraduate degree was not awarded by an institution in a country where English is the "official and spoken language". In other words, if you were required to submit TOEFL scores for admission, you will also have to pass the ECT. The GSAS policy is specified here and the SEAS policy is specified here.
Breadth Requirement
While the directed and thesis research
provides depth, it is also important to ensure breadth across the subfields of
Computer Science. The core
consists of five topics (analysis of algorithms, artificial
intelligence, computer architecture, programming languages and
translators, and operating systems), each of which may be satisfied by
an examination or a specified course. A
student must also complete five elective topics,
three of which must be distributed across the three main areas of Computer
Science (one each in AI, Systems and Theory). The other two electives may be taken in any
area, or from outside Computer Science. Some or all of the elective requirements may
be waived on the
basis of courses taken elsewhere, but the entire core must be fulfilled at Columbia.
Teaching/TAing
Success as a computer scientist depends not only on the ability to generate and explore new ideas but also on the ability to communicate those ideas effectively. For this reason, students are expected to develop and exercise presentation and teaching skills as part of their education. All students are required to fulfill two "teaching units", which may involve a combination of teaching assistant and/or instructor positions.
Candidacy Exam
The
candidacy exam is an oral exam based on a syllabus prepared jointly by
the student and his/her candidacy committee. Admission to candidacy
(passing the exam) certifies that the student has demonstrated a depth
of scholarship in the literature and the methods of the student's
chosen area of research, and has demonstrated a facility with the
scholarly skills of critical evaluation and verbal expression.
MPhil
The degree of Master of
Philosophy is conferred by GSAS upon a student who has fulfilled satisfactorily all
PhD milestones except the proposal and dissertation (i.e., English proficiency, breadth, candidacy, teaching). The MPhil also requires two Residence Units of advanced standing (completion of the MS here or elsewhere),
plus four additional Residence Units earned in GSAS. All work for the degree must be
completed within three years beyond the MS (or four years counting any time enrolled in SEAS). See the GSAS requirements for the MPhil.
Thesis Proposal
In
the thesis proposal, the student lays out an intended course of
research for the dissertation. By accepting the thesis proposal, the
student's dissertation committee agrees that the proposal is
practicable and acceptable, that its plan and prospectus are
satisfactory, and that the candidate is competent in the knowledge and
techniques required, and formally recommends that the candidate proceed
according to the prospectus and under the supervision of the
dissertation committee.
Dissertation and defense
The
doctoral dissertation and defense is typically completed during the
fifth or sixth year in the program. Some very highly motivated
students, particularly in theoretical areas, may finish in less time.
GSAS imposes a time-to-degree requirement of a maximum of eight calendar years registered in GSAS, or nine years
total counting any time enrolled in SEAS (details here). GSAS rules and regulations, including excruciatingly detailed dissertation formatting requirements, are available from the Dissertation Office. A latex template for the dissertation is here. Some defense hints can be found
here. The department's policy for "Pass With Distinction" is given here.