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Caltech awards the PhD degree principally to acknowledge comprehensive academic knowledge, profound research capabilities, and the ability to independently and effectively explore problems, rather than merely completing a fixed curriculum within a set timeframe. Degree requirements include conducting original research, preparing a thesis documenting this work, and undertaking advanced systematic studies, mainly in scientific or engineering disciplines. Candidates must also demonstrate articulate communication skills in both spoken and written English. Each student's doctoral work will be overseen by the academic division corresponding to their chosen field of specialization.
Applicants must have completed a bachelor's degree or the equivalent before beginning graduate study.
Applicants whose native language is not English and those who have had no formal instruction in English will be required to take a test to evaluate English proficiency. Please refer to "Required Tests" for a list of the GRE reporting requirements and the English proficiency exams currently accepted. The admissions committee may also consider research papers, publications and other original work.