What this is
What does 'backlog in weeks of capacity' mean?
What does 'backlog in weeks of capacity' mean?
It expresses the total hours of open work as a number of weeks the current crew would need to clear it at their normal output. Four to six weeks is generally treated as healthy; below that the team is likely firefighting reactive work instead of planning ahead, and above it work is accumulating faster than it can be cleared.
How is this different from the Schedule Compliance Review?
Schedule Compliance Review measures execution against a single week's published plan. This review looks across all open work regardless of which week it was scheduled for, grouped by how long it has been waiting and how critical the affected asset is. A job can pass one review and still be a backlog concern in the other.
What counts as an open work order here?
Any work order raised and not yet closed at the point the review is taken, including jobs waiting on parts, access, resource or a decision. Jobs closed during the review period as no longer required are recorded separately and removed from the ageing count, so the backlog reflects genuinely live work.
Scope
When is a maintenance backlog review required?
This review looks across all open work by age and criticality. Using it to record or resolve a single job, or to substitute for the weekly execution check, produces a record that can't be reconciled against either.
Use this template when
- The review period has closed and the planner has the full list of open work orders in hand
- The workspace is being set up and this monthly cadence needs a first ageing baseline
- You are running the Planned Maintenance programme and this is the checkpoint that follows the weekly schedule compliance cycle
- A linked record needs this one to exist, such as the work order it is ageing or the criticality assessment behind a job
- The oldest open job or the safety-critical count has moved and needs a documented decision on escalation
Do not use it for
- Weekly Maintenance Schedule, which sets the coming week of planned work against labour, parts and access windows — this review looks at everything still open, not one week ahead.
- Schedule Compliance Review, which reviews a single week's execution against that week's plan and its reason codes.
- Production Access Agreement, which records the specific access window negotiated for one job — cite its reference here rather than re-describing the negotiation.
- Critical Spares Review, which reviews stockholding decisions for parts, not the jobs waiting on those parts.
- Anything outside KnowMaintain, which belongs in the workspace that owns that process.
Compliance mapping
Which ISO 55001 cl.9.1 requirements does this satisfy?
ISO 55001 cl.9.1 requires monitoring, measurement, analysis and evaluation of asset management performance, including the extent to which planning intent is actually delivered. Backlog is one of the clearest signals that clause covers.
| Clause | Requirement | Where it lands |
|---|---|---|
| ISO 55001 cl.9.1 | Determine what needs to be monitored and measured | By age |
| ISO 55001 cl.9.1 | Determine when results from monitoring and measurement are to be analysed and evaluated | Header |
| ISO 55001 cl.9.1 | Analyse and evaluate asset management performance | By priority and criticality |
| ISO 55001 cl.9.1 | Evaluate the effectiveness of the asset management system in meeting objectives | Actions |
| ISO 55001 cl.9.1 | Retain documented information as evidence of monitoring and measurement results | Result |
| ISO 55001 cl.9.1 | Determine the extent to which planned activities are achieved and planned results attained | Related records |
| ISO 55001 cl.9.1 | Determine appropriate methods for valid monitoring and measurement results | By age |
What it does not cover
- Escalation Required, which is marked 'No' while Safety Critical Open and Statutory Overdue have both risen against the prior period.
- Backlog Trend, which is marked 'Stable' because the total job count barely moved, without checking whether the mix underneath shifted toward older, higher-criticality work.
- Capacity Adequate, which is scored 'Yes' while Backlog In Weeks Of Capacity sits well above the site's own healthy range.
- Jobs Closed As No Longer Required, which is left blank rather than recorded as zero, making it unclear whether the backlog was actually reviewed or simply re-totalled.
- Backlog Reviewed With Production, which is marked 'Yes' with no linked record or note showing what was agreed.
Global
Maintenance Backlog Review requirements by country
ISO 55001 is voluntary, but the weight placed on specific backlog lines changes sharply depending on what sits behind the asset register.
FSMA 21 CFR Part 117 preventive controls; BRCGS Food Safety equipment maintenance requirements
Food Safety Critical Open is not a discretionary internal figure — it maps directly to preventive controls an auditor will ask to see cleared or actively managed
A rising Food Safety Critical Open count with Escalation Required marked 'No' is a finding waiting to happen at the next audit, independent of the general backlog trend
29 CFR 1910.119 mechanical integrity provisions; Seveso III Directive safety management system requirements
Safety Critical Open and Oldest Open Job Days become the figures a regulator or insurer asks for directly, not just internal reliability metrics
An oldest open job of several months against a safety-critical asset needs a documented risk acceptance, not silence, once it is visible in this review
ISO 55001:2014 cl.9.1 and cl.10
The ageing profile is retained as objective evidence that the organisation actually evaluates whether planned work is being delivered, not just scheduled
A backlog review with no age breakdown, or one that never triggers an action, reads to an auditor as monitoring without evaluation
How to complete it
How to complete a maintenance backlog review, step by step
The fields that decide whether this record is a genuine review, rather than a re-total of last month's number, are the ones needing a judgement call.
Under 4 weeks, 4 to 12, over 12, and over 6 months are fixed bands, but deciding whether a job sitting at 11 weeks is treated as an emerging problem or left until it crosses the next threshold is a judgement the planner makes every month, and it should be made the same way each time.
Backlog Trend compares against 'recent weeks' with no fixed baseline defined on the form. Deciding whether that comparison is against last month, a rolling average, or the same period last year changes whether a slow creep gets caught before it becomes a step change.
Jobs Closed As No Longer Required removes work from the ageing count entirely. Who is allowed to make that call, and on what evidence, is not specified by the form — left unchecked, it becomes the easiest way to make an ageing backlog disappear without actually completing the work.
Capacity Adequate offers a middle option of 'Marginal' that has no numeric definition. Anchoring it to a specific range of Backlog In Weeks Of Capacity, rather than leaving it to feel, is what keeps three consecutive 'Marginal' months from quietly becoming the accepted normal.
What auditors find
Most common maintenance backlog review findings
Patterns that surface once the age and criticality lines are checked against the trend and escalation fields recorded alongside them.
| Finding | Clause | What fixes it |
|---|---|---|
| Safety Critical Open rises for two consecutive periods while Backlog Trend is marked 'Stable' | ISO 55001 cl.9.1 | Score Backlog Trend from the safety-critical and statutory lines specifically, not the general total, whenever either is non-zero. |
| Oldest Open Job Days exceeds six months with no linked action or CAPA reference | ISO 55001 cl.9.1 | Require an Action Required entry, and a documented risk acceptance if the job remains open, once Oldest Open Job Days crosses a fixed threshold. |
| Jobs Closed As No Longer Required spikes in the same month the total backlog would otherwise have risen | ISO 55001 cl.9.1 | Require a named approver and a one-line reason for each job closed this way, visible in the record rather than folded into a single count. |
| Capacity Adequate is marked 'Marginal' for three or more consecutive periods | ISO 55001 cl.9.1 | Escalate automatically once 'Marginal' repeats past a fixed count, rather than waiting for someone to notice the streak. |
| Food Safety Critical Open is non-zero but Escalation Required is 'No' | ISO 55001 cl.9.1 | Force Escalation Required to 'Yes' whenever Food Safety Critical Open or Statutory Overdue is above zero, removing the discretion. |
| Backlog Reviewed With Production is 'Yes' with no related work order or note referenced | ISO 55001 cl.9.1 | Require at least one linked work order reference or a short note whenever this field is marked 'Yes'. |
Case in point
Case in point: the total that hid the eight-month job
A site's backlog total sat close to 190 open work orders for six straight months, and Backlog Trend was marked 'Stable' every time because the count barely moved. What the total didn't show was that Jobs Closed As No Longer Required had quietly absorbed a steady stream of low-priority jobs each month, while one safety-critical work order — a guard interlock repair — sat untouched behind two hundred lower-priority items, ageing past twelve weeks and then past six months.
It surfaced only when a new maintenance manager asked for the age and criticality breakdown behind the headline number for the first time. Oldest Open Job Days was 243. The fix was a single afternoon once someone actually looked — the part had been in stores the whole time — but the review had been treated as a total to report rather than a list to check, so nobody had looked.
The template
The template, field by field
The form exactly as it installs. Every field, option, score and conditional rule is editable, and the links to other templates come with it.
6 sections
- Reference
- MNT-081
- Archetype
- Review
- Record ID
- BKL-2026-000
- Scoring
- Overdue critical work
- Direction
- Low is good
- Singleton
- Yes
- Basis
- ISO 55001 cl.9.1
- Links
- Links Work orders, Criticality
- Tags
- Planning, Backlog
- Sections
- 6
- Fields
- 45
- Follow up fields
- 3
- Repeating sections
- 0
- Links out
- 3
Header
10 fieldsReview ID*
Auto sequence. Format BKL-2026-000.
The record's own ID. Other templates point at this value.
Status*
Drives who this goes to next.
- Planned2 pts
- In progress2 pts
- Complete3 pts
- Deferred0 pts
- Open0 pts
- Closed3 pts
- Overdue0 pts
Date and Time*
Completed By*
Site*
Site ID*
Format SITE-000.
Links to FDN-001 Site ID
A Backlog Without An Age Profile Hides Things
The total number is meaningless. What matters is the safety critical job that has been waiting eight months behind two hundred low priority ones.
Period Reviewed*
Reviewed By*
Total Open Work Orders*
By age
6 fieldsUnder 4 Weeks*
4 To 12 Weeks*
Over 12 Weeks*
Over 6 Months*
Oldest Open Job Days*
Backlog In Weeks Of Capacity*
Between four and six weeks of work is healthy. Below that you are firefighting, above it you are drowning.
By priority and criticality
9 fieldsSafety Critical Open*
Food Safety Critical Open*
Statutory Overdue*
Critical Asset Work Open*
Overdue Preventive Maintenance*
Jobs Waiting On Parts*
Jobs Waiting On Access*
Jobs Waiting On Resource*
Jobs Waiting On A Decision*
Actions
6 fieldsJobs Closed As No Longer Required
A backlog full of jobs nobody intends to do is a backlog nobody will look at.
Duplicates Merged
Backlog Reviewed With Production*
- Yes3 pts
- No0 pts
Backlog Trend*
- Falling3 pts
- Stable2 pts
- Rising0 pts
Capacity Adequate*
- Yes3 pts
- Marginal1 pt
- No0 pts
Escalation Required*
- No3 pts
- Yes0 pts
Related records
1 fieldWork Order ID
A representative aged order.
Links to MNT-002 Work Order ID
Result
13 fieldsItems Assessed*
Excludes anything marked N/A.
Items Failed*
Score Percent*
Calculated on submission. High is good. N/A items leave the denominator.
Result Band*
- Pass3 pts
- Caution1 pt
- Fail0 pts
Completeness Percent*
How much of the template was actually answered. A high score on a half completed form is not a high score.
Action Required*
Raise the action record, then enter its reference here.
- No2 pts
- Yes0 pts
Priority
- High0 pts
- Medium1 pt
- Low3 pts
CAPA ID
Format CAPA-2026-00000.
Links to FDN-014 CAPA ID
Action Owner
Planner*
Signature*
Maintenance Manager*
Second Signature*
MNT-081 · record IDs look like BKL-2026-000 · Links Work orders, Criticality
Open in KnowellaRun it with agents
From a document you fill in to a programme that runs itself
The form is the easy part. Spotting the critical job buried behind two hundred low-priority ones, and pushing the escalation before the total quietly absorbs it, is the work that actually slips.
Holds the ageing and criticality breakdown against the live work order register, and flags when Safety Critical Open or Oldest Open Job Days moves even while the total looks flat.
Checks whether 'jobs waiting on parts' reason codes match actual stock-out records, so a backlog attributed to parts can be verified against the storeroom rather than assumed.
Watches the Food Safety Critical Open and Statutory Overdue lines specifically, since these map to obligations an audit will ask about independent of the general backlog trend.
Rolls the month's ageing profile, trend and escalation flag into one view for the maintenance manager, drafts the CAPA when a critical item crosses its age threshold, and holds every write for approval before it touches a record.
This template lives in KnowMaintain — asset maintenance. Work orders, planned maintenance, calibration, reliability and shutdowns.
Meet KnowMaintain→Glossary
Maintenance Backlog Review definitions and key terms
- Backlog in weeks of capacity
- Total open work expressed as how many weeks the current crew would need to clear it at normal output; a healthier signal than a raw job count.
- Ageing profile
- The breakdown of open work by how long it has been waiting, rather than a single total, used to catch jobs sliding past the thresholds that matter.
- Critical asset work
- Open work orders against assets classified as high consequence on failure, tracked separately because their age matters more than the general backlog's.
- Jobs closed as no longer required
- Work removed from the backlog on the basis that it is no longer needed, rather than completed — a legitimate but easily misused way to shrink the total.
- Escalation required
- A flag indicating the backlog, or a specific line within it, needs attention above the planner's own authority to resolve.
FAQ
Frequently asked questions about maintenance backlog review
Does a rising backlog always mean the team needs more people?+
Not necessarily. It can mean capacity is short, but it can equally mean access, parts or decisions are the actual constraint — the by-priority section exists specifically to separate those causes before anyone proposes headcount.
How often should this review run?+
Monthly is the standard cadence, run against the same registers each time so the ageing bands are comparable period to period. Running it less often lets a critical job age well past the point it should have been escalated.
What's the difference between this and the Schedule Compliance Review?+
Schedule Compliance Review is a weekly check on one week's plan versus execution. This review is a monthly look across everything still open, by age and criticality, regardless of which week it was originally scheduled for.
Should every aged job get a CAPA?+
No. A CAPA is for a genuine pattern or a safety-critical or statutory item ageing past a fixed point, not for every low-priority job that happens to be older than a month.
Who decides a job is no longer required?+
The form does not fix this by default, which is a gap worth closing locally — require a named approver and a short reason, since this field is the easiest way to shrink a backlog without doing the work.
What does 'backlog reviewed with production' actually confirm?+
That the planner has walked the aged list with production rather than reviewing it in isolation, since several of the common causes — access, resource diversion, decisions — sit on production's side of the fence, not maintenance's.
Keep going
Related templates and programmes
Industries this is written for
Programmes this belongs to
Used together in Planned Maintenance
Asset Register
Holds every piece of equipment, machine, vehicle and tool you track
Tool and Equipment Register
Holds portable tools, gauges, lifting accessories and small equipment that sit below asset level but still need control
Maintenance Request
Asks maintenance to look at a problem or carry out a job
Work Order
The main record for a planned maintenance job, covering what, where, who and when
Corrective Work Order
Covers a repair to fix something that has already failed or degraded
Emergency Work Order
Covers urgent work where equipment has stopped or become unsafe
More in Planning and Scheduling
Weekly Maintenance Schedule
Sets the coming week of planned work against available labour, parts and access windows
Schedule Compliance Review
Reviews what was scheduled against what was actually done, and why the gap exists
Production Access Agreement
Records the access window agreed with production for a job, and what happens if it overruns
Maintenance Cost Review
Reviews maintenance spend by asset, type and category over a period
Contractor Maintenance Work Order
Covers a maintenance job carried out by a contractor, holding the scope, permits, supervision and handback
Written and reviewed by
Siddarth Singh
Founder & Chief Executive Officer, Knowella
Certified Safety Professional and industrial and systems engineer with more than a decade inside food supply chain, freight and manufacturing operations. This page was written against the current text of the standards it cites, not against secondary summaries of them.
- Certified Safety Professional (CSP), Board of Certified Safety Professionals
- MBA, University of Chicago Booth School of Business
- MS and BS, The Ohio State University, Industrial and Systems Engineering
- Six Sigma Black Belt
Sources and last review. Reviewed 16 August 2026 against:
- ISO 55001:2014 cl.9.1 — Monitoring, measurement, analysis and evaluation
- ISO 55000:2014 — Asset management: overview, principles and terminology
- 21 CFR Part 117 — FSMA current good manufacturing practice and preventive controls
- 29 CFR 1910.119 — Process safety management, mechanical integrity
This page is general guidance, not legal advice. Confirm requirements with your jurisdiction’s regulator.