Step 1 of the Sequential evaluation process is relevant to which types of applicants?

Step 1 of the Sequential Evaluation Process is designed to evaluate the work activity of applicants for Social Security Disability benefits, which includes both Title II (Social Security Disability Insurance – SSDI) and SSI (Supplemental Security Income) applicants. This initial step assesses whether the individual is engaged in substantial gainful activity (SGA). If an applicant is working and earning above a certain threshold, they may not be considered disabled under the Social Security Administration's criteria, regardless of the type of benefits they are applying for.

Since both Title II and SSI programs have similar criteria concerning work activity, it is important to recognize that applicants for either type of benefit must undergo this initial evaluation. This broad applicability is why the correct answer encompasses both Title II and SSI applicants.