In contrast to the standard research definition of CFS, the Fukuda Definition, the Canadian Consensus Criteria (CCC) was written by ME/CFS professionals for physicians. A long document produced in 2003, it provides a comprehensive picture of the disease, and is preferred by many doctors and patients. The CCC posits that postexertional malaise and cognitive problems are hallmarks of this disorder. The CCC was superseded by the publication of the International Consensus Criteria in 2011.
Click on this link to view the Canadian Consensus Criteria