revision

In regulated industrial and manufacturing environments, a revision is a controlled update to a document, specification, standard, or configuration that results in a new, uniquely identifiable version.

What a revision typically includes

A revision usually involves one or more of the following:

• Changes to technical content, such as drawings, work instructions, or test methods
• Administrative updates, such as terminology alignment or formatting that affects official references
• Assignment of a new identifier, such as a revision letter (A, B, C, D) or number (1, 2, 3)
• Approval and effective-date control through a document control or change control process

In quality and compliance contexts, each revision must be traceable, with records of what changed, who approved it, and when it became effective.

Revisions in standards and specifications

Industry and quality standards are commonly issued in revisions. For example, standards such as AS9100 use revision letters (e.g., AS9100C, AS9100D) to indicate successive controlled updates. The base standard name typically remains the same, while the revision identifier distinguishes the specific version that applies.

Similarly, internal specifications, standard operating procedures (SOPs), drawings, and software configuration documents in manufacturing are tracked by revision so that operations, audits, and customers can confirm exactly which version was used.

Operational use in manufacturing systems

In manufacturing IT and OT systems, revisions appear as:

• Document revision fields in document management and quality systems
• Revision-controlled part numbers in ERP/MRP and PLM systems
• Versioned master data and recipes in MES and automation systems
• Change history logs tied to engineering change orders (ECOs) or similar records

These controls help ensure that only the correct and approved revision is used on the shop floor and that historical production can be linked back to the exact revision of the governing documents.

What a revision is not

A revision is not:

• An informal or unapproved edit that bypasses change control
• A completely different standard or specification with a new root identifier
• Just a file name change without controlled content review and approval

Common confusion

Revision vs. version: In many manufacturing and quality contexts the terms are used interchangeably to describe controlled updates. Some organizations reserve revision for formal documents and drawings, and version for software and configuration. Usage depends on internal conventions.

Revision vs. change request: A change request or engineering change order initiates and documents the desire to change something. The revision is the resulting updated, approved state of the document, drawing, or configuration.

Context from industry standards

For external standards used in regulated manufacturing, such as aerospace or automotive quality standards, the revision identifier (letter or year) is part of how organizations specify which requirements they follow and which edition applies to contracts, audits, and internal procedures.