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Caltech awards the PhD degree principally to acknowledge a scholar's comprehensive knowledge, profound research contributions, and ability to conduct independent, effective investigations - not merely for finishing a prescribed curriculum within a set timeframe. Degree requirements include conducting original research, composing a thesis documenting this work, and pursuing advanced systematic studies, mainly in scientific or engineering disciplines. Candidates must also demonstrate articulate communication skills in both spoken and written English.
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.