The PhD in Computer Science requires coursework, qualifying and comprehensive examinations, and a doctoral dissertation that is first proposed and eventually defended. The general doctoral requirements of the University apply to this program.
The CS PhD section of the GMU Catalog is the official source for the degree requirements of the program.
These slides from the orientation for new PhD students provide an overview of the program, as well as additional useful information.
For more detailed information on the coursework and requirements of the Ph.D. program, please see these pages.