The opinion of the court was delivered by: Jean P. Rosenbluth U.S. Magistrate Judge
MEMORANDUM OPINION AND ORDER
Plaintiff seeks review of the Commissioner's final decision denying his application for Supplemental Security Income ("SSI"). Pursuant to the Court's Case Management Order, the parties filed a Joint Stipulation on October 12, 2011. The Court has taken the Joint Stipulation under submission without oral argument. For the reasons stated below, the Commissioner's decision is remanded for further proceedings.
Plaintiff was born on September 8, 1968. (Administrative Record ("AR") 20.) He has an 11th-grade education and no past relevant work experience. (AR 18-19.)
On December 31, 2007, Plaintiff filed an application for SSI, alleging that he had been unable to work since February 1, 2004, because of chronic low-back pain and scoliosis. (AR 144.) After Plaintiff's application was denied by the Social Security Administration, Plaintiff requested a hearing before an Administrative Law Judge ("ALJ"). (AR 102.) A hearing was held on April 1, 2009, at which time Plaintiff appeared with counsel and testified on his own behalf. (AR 28-50.) A vocational expert ("VE") also testified. (AR 44-48.) The ALJ determined that Plaintiff was not disabled. (AR 14.) On January 20, 2011, the Appeals Council denied Plaintiff's request for review. (AR 1--6.) This action followed.
Pursuant to 42 U.S.C. § 405(g), a district court may review the Commissioner's decision to deny benefits. The Commissioner's or ALJ's findings and decision should be upheld if they are free from legal error and are supported by substantial evidence based on the record as a whole. 42 U.S.C. § 405(g); Richardson v. Perales, 402 U.S. 389, 401, 91 S. Ct. 1420, 1427, 28 L. Ed. 2d 842 (1971); Parra v. Astrue, 481 F.3d 742, 746 (9th Cir. 2007). Substantial evidence means such evidence as a reasonable person might accept as adequate to support a conclusion. Richardson, 402 U.S. at 401; Lingenfelter v. Astrue, 504 F.3d 1028, 1035 (9th Cir. 2007). It is more than a scintilla but less than a preponderance. Lingenfelter, 504 F.3d at 1035 (citing Robbins v. Soc. Sec. Admin., 466 F.3d 880, 882 (9th Cir. 2006)). To determine whether substantial evidence supports a finding, the reviewing court "must review the administrative record as a whole, weighing both the evidence that supports and the evidence that detracts from the Commissioner's conclusion." Reddick v. Chater, 157 F.3d 715, 720 (9th Cir. 1996). "If the evidence can reasonably support either affirming or reversing," the reviewing court "may not substitute its judgment" for that of the Commissioner. Id. at 720-721.
IV. THE EVALUATION OF DISABILITY
People are "disabled" for purposes of receiving Social Security benefits if they are unable to engage in any substantial gainful activity owing to a physical or mental impairment that is expected to result in death or which has lasted or is expected to last for a continuous period of at least twelve months. 42 U.S.C. § 423(d)(1)(A); Drouin v. Sullivan, 966 F.2d 1255, 1257 (9th Cir. 1992).
A. THE FIVE--STEP EVALUATION PROCESS
The Commissioner (or ALJ) follows a five-step sequential evaluation process in assessing whether a claimant is disabled. 20 C.F.R. § 416.920(a)(4); Lester v. Chater, 81 F.3d 821, 828 n.5 (9th Cir. 1995) (as amended Apr. 9, 1996). In the first step, the Commissioner must determine whether the claimant is currently engaged in substantial gainful activity; if so, the claimant is not disabled and the claim is denied. 20 C.F.R. § 416.920(a)(4)(i). If the claimant is not engaged in substantial gainful activity, the second step requires the Commissioner to determine whether the claimant has a "severe" impairment or combination of impairments significantly limiting her ability to do basic work activities; if not, a finding of non-disability is made and the claim is denied. 20 C.F.R. § 416.920(a)(4)(ii). If the claimant has a "severe" impairment or combination of impairments, the third step requires the Commissioner to determine whether the impairment or combination of impairments meets or equals an impairment in the Listing of Impairments ("Listing") set forth at 20 C.F.R., Part 404, Subpart P, Appendix 1; if so, disability is conclusively presumed and benefits are awarded.
20 C.F.R. § 416.920(a)(4)(iii). If the claimant's impairment or combination of impairments does not meet or equal an impairment in the Listing, the fourth step requires the Commissioner to determine whether the claimant has sufficient residual functional capacity ("RFC")*fn1 to perform his past work; if so, the claimant is not disabled and the claim is denied. 20 C.F.R. § 416.920(a)(4)(iv). The claimant has the burden of proving that he is unable to perform past relevant work. Drouin, 966 F.2d at 1257. If the claimant meets this burden, a prima facie case of disability is established. Id. If that happens or if the claimant has no past relevant work, the Commissioner then bears the burden of establishing that the claimant is not disabled because he can perform other substantial gainful work available in the national ...