What is the test for a disability claimant who is unable to walk to work?

"First, the Secretary must show that the claimant's impairment is of a kind that still permits certain types of activity, such as lifting or walking, necessary for other occupations, and that the claimant's experience involves skills transferable to other work. Second, the Secretary must present evidence showing the existence of specific types of jobs, available in the national economy, suitable for a claimant with these capabilities and skills." Decker v. Harris, supra, 647 F.2d at 294.