What is the test for determining whether a person has been found to have an impairment that is not listed on a disability list?

In the third step of the process, it must be determined whether the impairment is equivalent to one of a number of listed impairments that the Secretary acknowledges are so severe as to preclude substantial gainful activity. See 20 C.F.R. 404.1520(d); 20 C.F.R. Part 404 Appendix 1 to Subpart P. If the impairment meets or equals one of the listed impairments, the claimant is conclusively presumed to be disabled. If a condition "falls short of the [listing] criterion" a multiple factor analysis is appropriate. Celaya v. Halter, 332 F.3d 1177, 1181 (9th Cir. 2003). In conducting such analysis, "the Secretary

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