20 CFR 220.126: Relationship of ability to do work and residual functional capacity.

(a) If the claimant can do his or her previous work (his or her usual work or other applicable past work), the Board will determine he or she is not disabled.

(b) If the residual functional capacity is not enough for the claimant to do any of his or her previous work, the Board must still decide if the claimant can do any other work. To determine whether the claimant can do other work, the Board will consider the claimant's residual functional capacity, and his or her age, education, and work experience. Any work (jobs) that the claimant can do must exist in significant numbers in the national economy (either in the region where he or she lives or in several regions of the country).