One of the tenants of the Canada Pension Plan definition of disability is that the Appellant must be "incapable of regularly pursuing any substantially gainful occupation.
Remember this - Predictability is the essence of Regularity.
My client Bill had chronic fatigue. The Tribunal in their decision found that Bill's evidence was credible and sincere. The Review Tribunal accepted that he could no longer work due to the multiple effects of chronic fatigue, arthritic pain, and a general lack of energy.
The Minister argued that he still had capacity to work because he had "some good days".
The Review Tribunal found that the Appellant having "good days and bad days" did not equate to his ability to seek and maintain employment because he would not be predictable.
Chandler v. MHRD CP 4040 stated that "despite brief periods of work capacity, the unpredictability of the Appellant's chronic fatigue and pain flare-ups and his need for frequent rests, rendered him incapable of regularly maintaining any substantially gainful occupation in the real world."