# NDT procedure vs technique sheet

> An NDT procedure is the controlled, Level 3-approved document that defines how a method is applied for a range of applications under a code; a technique sheet (or work instruction) applies that procedure to a specific job with the exact probe, angles, calibration, scan plan and acceptance criteria.

- Source: https://amps.global/glossary/procedure-vs-technique-sheet/
- Type: Glossary
- Published: 2026-09-05
- Tags: quality, NDT

## Key facts

- Procedures are qualified or demonstrated and carry revision control; technique sheets are derived from them per job
- ASME V requires written procedures with essential and non-essential variables; a change to an essential variable requires requalification
- Level 1 technicians work to technique sheets or instructions; Level 2 may write them; Level 3 approves procedures
- Both are audited: the assessor checks that the technique used on site matches an approved procedure

Also known as: NDT procedure, technique sheet, work instruction, scan plan.

## Why the distinction matters

A procedure that tries to cover every job becomes unusable; a technique sheet without an approved procedure behind it is unsupported. Keeping the two levels separate is how companies stay flexible and auditable at the same time.

## In AMPS

Approved procedures live in your document library in OneDrive, SharePoint or Google Drive; job-specific technique details and the resulting report are attached to the job in AMPS, where the history feature records revisions and who uploaded them.

## Related pages

- [Document control](https://amps.global/glossary/document-control/)
- [Revision control](https://amps.global/glossary/revision-control/)
- [NDT certification levels](https://amps.global/glossary/ndt-certification-levels/)

## Sources

- [ASME Boiler and Pressure Vessel Code](https://www.asme.org/codes-standards/bpvc-standards)
- [ASNT - American Society for Nondestructive Testing](https://www.asnt.org/)