Glossary

special process approval

Formal acceptance that a special process is controlled and suitable for use when output cannot be fully verified later.

Quality, Compliance and Traceability Audit and Compliance Readiness (AS9100, LPAs and Process Audits)Quality, NCR, and Continuous Improvement

Special process approval commonly refers to the formal acceptance of a manufacturing process whose results cannot be fully verified by later inspection or testing alone. In these cases, confidence in product conformity depends on controlling the process itself, including the method, equipment, materials, parameters, personnel qualifications, and records.

Typical examples include heat treating, welding, brazing, plating, coating, soldering, bonding, sterilization, and some cleaning or surface treatment operations. Whether a process is considered special can vary by industry, product, customer requirement, or quality system.

Special process approval is not the same as approving a finished part, a work instruction, or a supplier in general. It focuses on the capability and control of a specific process under defined conditions. Approval may involve process qualification, documentation review, source approval, operator certification, equipment validation, test coupons, first-run evidence, or periodic reapproval, depending on the organization and applicable requirements.

How it appears in operations

In manufacturing and regulated environments, special process approval often appears as a controlled status in quality, MES, ERP, or supplier management workflows. For example, a routing step may require an approved outside processor, approved internal work center, current process specification revision, and evidence that the required qualifications remain in effect before work can proceed.

Organizations also use the term when linking purchase orders, work orders, certificates, travelers, and traceability records to a process that requires tighter oversight than standard inspection-based operations.

Common confusion

Special process approval vs. supplier approval: supplier approval concerns whether a supplier is authorized to provide goods or services. Special process approval concerns whether a specific process, at that supplier or internally, is accepted for use.
Special process approval vs. product approval: product approval concerns acceptance of the part or assembly. Special process approval concerns control of the process used to create certain characteristics.
Special process approval vs. validation: validation is often one component of approval, but the approval decision may also include procedural, contractual, qualification, and recordkeeping requirements.

Why the term matters

The term matters because some product characteristics cannot be reliably confirmed after the fact without destructive testing, impractical testing, or incomplete inspection coverage. In those cases, organizations commonly rely on approved process controls and objective evidence to manage risk and maintain traceability.

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