What is the test to determine whether a plaintiff has an impairment that limits their ability to work?

In order to be entitled to benefits, the plaintiff must have an impairment severe enough to significantly limit the physical or mental ability to do basic work activities. See 20 C.F.R. 404.1520(c), 416.920(c). In determining whether a claimant's alleged impairment is sufficiently severe to limit the ability to work, the Commissioner must consider the combined effect of all impairments on the ability to function, without regard to whether each impairment alone would be sufficiently severe. See Smolen v. Chater, 80 F.3d 1273, 1289-90 (9th Cir.

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