OSHA defines 'qualified person' in 29 CFR 1926.32(m). The bar is professional capability demonstrated through credentials or deep experience: a recognized degree, certificate, or professional standing, or extensive knowledge, training, and experience that has been used to successfully solve problems in the relevant subject. Where a competent person recognizes hazards and can correct them, a qualified person is the technical authority who can engineer, evaluate, and certify.
The qualified-person role attaches to the more technical inspection and engineering tasks. The annual comprehensive crane inspection under 1926.1412(f) must be performed by a qualified person; critical-lift and personnel-platform plans are designed or reviewed by a qualified engineer; structural and load-bearing assessments, and certifications of load-test results, require qualified persons. The FMCSA's parallel concept for the DOT annual inspection is the 'qualified inspector' under 49 CFR 396.19.
The distinction from a competent person is the depth and nature of the expertise. A competent person makes day-to-day go/no-go safety calls and has authority to correct hazards; a qualified person brings engineering-grade technical judgment to design, analyze, and certify. Many tasks require both — a competent person runs the each-shift crane check, while a qualified person performs the annual teardown inspection and signs off on the lift plan.
Like competence, qualification is task-specific and employer-designated, but it is more often backed by formal credentials — a professional engineer's license, a recognized inspector certification, or manufacturer training — because the work being certified carries engineering and life-safety weight.