Standards library
GLS Accreditation Standards
Each GLS standard is a structured framework of clauses, criteria, evidence requirements and scoring methodology. Expand any standard to see every criterion, the evidence it requires, its weighting and exactly how it is benchmarked.
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GLS accreditation and ISO certification
GLS accreditation incorporates applicable principles and requirements from ISO 21001:2025. GLS is an independent accreditation body: it is not ISO, it does not issue ISO certification, and GLS accreditation is not equivalent to ISO certification.