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A manufacturing readiness level (MRL) is a 1-to-10 scale that measures how mature the ability to manufacture a technology is. It is used mainly in United States defense acquisition, and it appears in proposals, program descriptions and technical reviews that need to say how close a design is to being produced reliably, not just built once. This guide sets out the ten levels, pairs each with the acquisition milestone and minimum technology readiness level (TRL) the U.S. Government Accountability Office (GAO) associated with it, lists the nine assessment threads, and explains where the scale comes from. Wording below follows GAO-10-439 (April 2010) and the Department of Defense announcement of the 2025 MRL Deskbook, both checked on 2026-10-29.
What is a manufacturing readiness level, and who runs it?
An MRL is a measurement scale designed to improve the management and communication of manufacturing risk and readiness throughout acquisitions. GAO describes it as a measure of the manufacturing maturity or readiness of a given technology, manufacturing process, system, or element of a weapon system at various phases of the acquisition life cycle. It is deliberately similar in shape to the technology readiness level scale: a numbered ladder with defined entry conditions at each rung.
The scale has a defense-and-industry origin. According to GAO-10-439, a joint defense and industry working group was established in 2004 to develop MRLs, and the level definitions in GAO’s appendix are attributed to the Joint Defense Manufacturing Technology Panel, which GAO records as chartered on June 8, 1999. The Department of Defense maintains the working guidance: on 20 May 2025 the Defense Systems Information Analysis Center (DSIAC) reported that the Department had released the 2025 version of the MRL Deskbook, which “provides best practices for conducting manufacturing assessments using MRL criteria.”
MRL is therefore an assessment method, not a funding program. There is no application, no award and no eligibility test for having an MRL; a program office, a contractor or a reviewer assigns a level by assessing evidence against the criteria for that level.
MRL 1 to 10 at a glance
The table gives the level titles as GAO printed them in 2010, with the acquisition milestone and minimum TRL that GAO’s summary ties to the level where it states one. Later Deskbook editions revised some wording, so cite the edition you are using rather than assuming these titles are current.
| MRL | Title (GAO-10-439, 2010) | Milestone link | Minimum TRL |
|---|---|---|---|
| 1 | Basic Manufacturing Implications Identified | Lowest level; basic research begins as studies | — |
| 2 | Manufacturing Concepts Identified | — | — |
| 3 | Manufacturing Proof of Concept Developed | — | — |
| 4 | Capability to Produce the Technology in a Laboratory Environment | Exit criteria for materiel solution analysis, approaching Milestone A | 4 |
| 5 | Capability to Produce Prototype Components in a Production-Relevant Environment | — | 5 |
| 6 | Capability to Produce a Prototype System or Subsystem in a Production-Relevant Environment | Readiness for Milestone B | 6 |
| 7 | Capability to Produce Systems, Subsystems, or Components in a Production-Representative Environment | — | 7 |
| 8 | Pilot-Line Capability Demonstrated; Ready to Begin Low-Rate Initial Production | Milestone C | 7 |
| 9 | Low-Rate Production Demonstrated; Capability in Place to Begin Full-Rate Production | — | 9 |
| 10 | Full-Rate Production Demonstrated and Lean Production Practices in Place | Highest level of production readiness | 9 |
Read as a ladder, the middle of the scale is where the environment changes. MRL 4 is production of the technology in a laboratory. MRL 5 and 6 move to a production-relevant environment, first for prototype components and then for a prototype system or subsystem. MRL 7 moves to a production-representative environment. MRL 8 is the first level framed around a pilot line and the start of low-rate initial production, and MRL 9 and 10 describe demonstrated low-rate and then full-rate production.
MRL vs TRL: how they pair
The two scales answer different questions. A TRL describes how mature the technology is; an MRL describes how mature the capability to produce it is. GAO’s summary pairs them by giving a minimum TRL for each MRL from level 4 upward, so a high MRL goes with a technology that has matured to match. The pairing is a floor, not an equivalence: MRL 8 appears with a minimum TRL of 7, and MRL 9 and 10 with a minimum of 9.
For the technology side of the pairing, see the CASRAI entry on technology readiness level (TRL).
The nine MRL threads
An MRL is not a single judgment. GAO’s second table sets out nine threads, the risk areas along which manufacturing readiness is assessed, and defines the desired progress for each thread at each MRL:
- Technology and the Industrial Base
- Design
- Cost and Funding
- Materials
- Process Capability and Control
- Quality Management
- Manufacturing Personnel
- Facilities
- Manufacturing Management
A level is a summary of these threads, which is why two programs at the same MRL can be strong in different places. When you read a stated MRL, the useful follow-up question is which threads set it.
When MRLs are assessed
GAO frames MRLs against the phases of the defense acquisition life cycle, so the natural assessment points are the milestone decisions in the table: approaching Milestone A (MRL 4), readiness for Milestone B (MRL 6) and Milestone C (MRL 8). The 2025 Deskbook is described by DSIAC as best practices for conducting manufacturing assessments using MRL criteria, so the working procedure, including who performs an assessment and how evidence is scored, belongs to the Deskbook edition in force and not to this summary.
Common mistakes when citing an MRL
- Quoting a level without an edition. Level titles and criteria have been revised across Deskbook editions. State the source and year alongside the number.
- Treating MRL and TRL as the same scale. They measure different things, and GAO’s pairing sets a minimum TRL for each MRL rather than making them interchangeable.
- Reporting one number with no threads. The level summarizes nine threads; a bare number hides which of them is limiting.
- Reading a high level as a production claim before MRL 8. Pilot-line capability and readiness to begin low-rate initial production first appear at MRL 8 in GAO’s wording.
- Confusing the scale with funding. An MRL is an assessment of readiness, not an award category.
Related reading on CASRAI
Readers coming to MRLs from the funding and commercialization side may find these entries useful alongside the scale itself: proof-of-concept funding, the SBIR program, and how technology transfer offices evaluate and price a license.
FAQ
What does MRL stand for?
MRL stands for manufacturing readiness level. It is a scale from 1 to 10 that measures the maturity of the capability to manufacture a technology, process, system or element of a system.
How many manufacturing readiness levels are there?
Ten. GAO-10-439 lists MRL 1 (basic manufacturing implications identified) through MRL 10 (full-rate production demonstrated and lean production practices in place).
What is the difference between MRL and TRL?
TRL rates the maturity of the technology; MRL rates the maturity of the ability to produce it. GAO pairs a minimum TRL with each MRL from level 4 upward.
Who created the MRL scale?
GAO reports that a joint defense and industry working group was established in 2004 to develop MRLs, with the level definitions attributed to the Joint Defense Manufacturing Technology Panel.
Is there a current official MRL document?
The Department of Defense announced the 2025 version of the MRL Deskbook, according to DSIAC on 20 May 2025. This guide’s level titles come from GAO’s 2010 report, so check the Deskbook edition you are working to for current wording.
Sources
- U.S. Government Accountability Office, Best Practices: DOD Can Achieve Better Outcomes by Standardizing the Way Manufacturing Risks Are Managed, GAO-10-439, April 2010, gao.gov/new.items/d10439.pdf. Checked 2026-10-29.
- Defense Systems Information Analysis Center (DTIC), Systems Digest, 20 May 2025, announcing the 2025 MRL Deskbook, dsiac.dtic.mil/digests/20-may-2025. Checked 2026-10-29.
