7. Maintenance Planning, Scheduling and Work Control

Introduction and Context

Maintenance performance depends not only on technical competence but also on the quality of decisions made before work begins. A technically excellent technician may still produce poor results when the job is inadequately defined, materials are unavailable, access has not been arranged, isolation is incomplete, or several competing priorities disrupt the planned sequence. Maintenance planning, scheduling and work control provide the management system that converts identified needs into safe, coordinated and economically justified work.

Planning determines what must be done, how it should be done, what resources are required, and what risks must be controlled. Scheduling determines when the work should be performed and how available resources will be allocated. Work control governs the movement of a job from identification through approval, preparation, execution, feedback and closure. These activities link reliability engineering, operations, stores, procurement, health and safety, contractors and finance.

The purpose is not to maximise the volume of maintenance activity. It is to deliver the right work, at the right time, with the right resources, while protecting people, assets, production and the environment. Effective work control therefore balances reliability risk, operational priorities, cost, statutory obligations and resource constraints.

Learning Objectives

After studying this chapter, students should be able to:

1. Explain the relationship between maintenance planning, scheduling and work control.

2. Design a workflow for identifying, screening, prioritising and authorising maintenance work.

3. Prepare job plans involving labour, materials, tools, permits, safety controls and technical information.

4. Develop weekly and daily schedules while managing emergent work and competing priorities.

5. Explain backlog control, shutdown planning and coordination with operations.

6. Evaluate work-control performance using meaningful indicators.

7. Identify common implementation failures and recommend improvements using digital and analytical tools.

The Architecture of Maintenance Work Management

A maintenance work system is a closed loop. It begins with the recognition of a need and ends with organisational learning. The principal stages are:

Identification: A defect, inspection finding, failure, statutory requirement or improvement opportunity is reported.

Screening: The request is checked for validity, duplication, urgency, safety significance and whether maintenance is the appropriate response.

Prioritisation: The work is ranked according to consequence, probability, time sensitivity, regulatory requirements and production impact.

Planning: The planner develops the method, estimates labour and duration, identifies materials and tools, reviews drawings and determines permits and access requirements.

Scheduling: Approved and ready work is assigned to a time period and resource group, taking account of production windows, constraints and capacity.

Execution: The supervisor coordinates the job, ensures safe conditions, allocates resources and manages deviations.

Feedback and closure: Actual hours, materials, failure information, measurements, causes, recommendations and follow-up actions are recorded.

Analysis and improvement: Data are used to revise preventive-maintenance tasks, job plans, spares policies, training and asset strategies.

This sequence is not strictly linear. A planner may return a request for clarification; a scheduler may defer work because a critical material is unavailable; execution may reveal a wider defect; and feedback may create a new engineering action. The system must therefore be controlled without becoming bureaucratic.

Important Terminology

A work request is an initial notification of a maintenance need. A work order is an authorised instruction containing the scope and control information needed to perform work. A job plan is a repeatable description of the method, resources, precautions and estimated effort. A backlog is approved work that has not yet been completed. Ready backlog consists of work whose necessary resources and conditions are available. Schedule compliance measures the extent to which scheduled work is completed as planned. Break-in work is unscheduled work inserted into an active schedule. A frozen schedule is a period during which changes require explicit approval. A permit to work is formal authorisation for hazardous or controlled work. Lockout/tagout or an equivalent energy-isolation process prevents unintended energisation. A constraint is anything that prevents safe or efficient execution. A shutdown is a planned production stoppage undertaken to perform coordinated maintenance, inspection, modification or statutory work.

From Work Identification to Authorisation

Work identification may originate from operator rounds, condition monitoring, preventive-maintenance inspections, breakdown reports, statutory inspections, engineering change proposals or observations made during previous work. The quality of the initial description strongly influences every later stage. “Pump noisy” is less useful than “Pump P-204 has increased vibration at the drive-end bearing, measured at 9.2 mm/s on 12 June, with no visible leakage.”

The person raising the request should record the asset, location, observed condition, operational effect, date, evidence and immediate risk. Where possible, photographs, vibration readings, alarm histories or samples should accompany the request. Operators should not be expected to diagnose the final cause; they should describe the condition accurately.

The maintenance coordinator or supervisor then screens the request. Screening should answer four questions:

• Is the request genuine and sufficiently defined?
• Is there an immediate danger to people, environment or equipment?
• Is the work a maintenance issue, an operational adjustment, an engineering modification or a procurement matter?
• Does a duplicate work order or existing campaign already address it?

Emergency work is work requiring immediate response because delay creates unacceptable risk. Urgent work requires prompt attention but can be safely controlled within a short planning period. Routine work can be planned within the normal weekly cycle. Improvement work may be valuable but is usually ranked below work that protects safety, legal compliance or asset function.

Prioritisation should be based on risk rather than the loudest requestor. A practical priority model considers consequence, likelihood, time sensitivity, detectability and available protection. A high-consequence failure mode with limited warning may receive priority even when its probability is moderate. Conversely, a cosmetically undesirable condition may be deferred when it has negligible effect on function or risk.

A numerical priority score can support consistency, but it should not replace judgement. For example:

Priority index = consequence × likelihood × time sensitivity

The scales and thresholds must be defined locally. Critical safety or statutory work should be escalated independently of a calculated score. The priority decision, rationale and required completion date should be visible in the work order.

Planning the Job Before the Craftsperson Arrives

Planning is a mental and organisational activity performed before execution. Its objective is to remove avoidable delay, uncertainty and exposure from the field. Planning does not mean predicting every event. It means preparing a safe and efficient baseline against which deviations can be managed.

A job plan commonly contains:

• a clear statement of scope and acceptance criteria;
• asset identification and relevant drawings, manuals and history;
• work steps in a logical sequence;
• required skills, crew size and estimated labour hours;
• tools, lifting equipment, test instruments and temporary facilities;
• materials, components, lubricants and consumables;
• isolations, permits, gas testing and personal protective equipment;
• access, scaffolding, cleaning and waste arrangements;
• quality checks, testing and return-to-service requirements;
• environmental controls and contingency actions.

The scope must be sufficiently precise to prevent both omission and uncontrolled expansion. A planner should distinguish the known task from possible follow-on work. For example, replacing a coupling element may require inspection of the shaft, keyway and guards, but replacement of a damaged shaft should be treated as a separately authorised scope unless the contingency has been approved.

Work estimation involves estimating crew size, productive labour hours, elapsed duration and resource availability. Labour hours and elapsed time are not identical. A four-hour job requiring two technicians represents eight labour hours but may occupy a six-hour window after isolation and testing. Estimates should be based on historical actuals, standard job plans, engineering calculations or informed expert judgement. Inflated estimates conceal productivity problems, while optimistic estimates create repeated schedule failure.

Material planning is a frequent source of maintenance delay. The planner should verify the exact specification, quantity, interchangeability, preservation requirements and stock status. “Available in stores” is not sufficient if the item is reserved for another asset, obsolete, damaged or awaiting inspection. Long-lead materials should be identified at the request stage. Critical spares policy should be connected with failure consequence and supply risk rather than with unit cost alone.

A job should normally be classified as ready only when the scope is clear, labour is available, materials and tools are accessible, permits and isolations are understood, and the operating window is feasible. Scheduling work that is not ready creates apparent activity but low completion and high frustration.

Permits, Risk Controls and Interfaces with Operations

Maintenance work takes place within an operating system. Planning must therefore include a joint review with operations, safety personnel and, where relevant, engineering and contractors. The work party may require a permit for hot work, confined-space entry, excavation, electrical intervention, line breaking, work at height or radiography. Permit requirements vary by organisation and jurisdiction, but the underlying principle is constant: hazardous work must be authorised, isolated, communicated and verified.

A job safety analysis identifies hazards, consequences, controls and responsible persons. Controls should follow the hierarchy of controls: eliminate the hazard where possible, substitute safer methods, apply engineering controls, establish administrative controls and use personal protective equipment as the final barrier. A permit is not a substitute for sound planning, nor is a risk assessment a one-time formality. Conditions must be rechecked when the work environment changes.

Energy isolation requires particular discipline. Electrical, hydraulic, pneumatic, mechanical, thermal, chemical, gravitational and stored energies may all require control. The responsible authority should identify isolation points, apply locks or equivalent devices, release stored energy and verify zero energy before work begins. Return to service requires inspection, removal of tools, restoration of guards, clearance of personnel and formal communication with operations.

Interfaces must be explicit. Operations may provide access and isolation; maintenance may execute the task; engineering may approve a design change; stores may issue parts; contractors may supply specialist labour. Confusion over responsibility is a common cause of delay and unsafe assumptions. The work order or coordination meeting should identify the responsible person for each interface.

Scheduling: Converting Readiness into an Executable Plan

Scheduling allocates work to time, people and equipment. A schedule should be realistic enough to guide execution and flexible enough to accommodate genuine emergencies. It is not simply a list of work orders sorted by priority.

A useful planning hierarchy includes:

1. Annual or strategic outlook: major shutdowns, statutory inspections, budget assumptions and resource strategy.

2. Monthly look-ahead: major work, contractor requirements, long-lead materials and production windows.

3. Weekly schedule: specific ready jobs assigned to crews and days.

4. Daily coordination: permits, access, isolations, emergent work and progress review.

5. Shift-level control: task allocation, field decisions, handover and status reporting.

The weekly schedule should be developed jointly by maintenance and operations. It should show job priority, asset, estimated hours, crew or skill, location, required outage, constraints and planned completion date. Capacity is calculated by considering available labour hours rather than nominal headcount. Leave, training, meetings, travel, supervision, statutory activities and expected emergency response reduce effective capacity.

A common discipline is to protect a short frozen period. During this period, changes require supervisor or manager approval. The purpose is not rigidity; it is to prevent continual disruption and to make the cost of break-in work visible. A schedule that is changed casually cannot be used to assess planning quality.

Schedule compliance should distinguish work completed as scheduled from work merely completed during the week. A team that abandons planned preventive work to complete unplanned jobs may show high total completion but poor schedule compliance and rising risk. Both measures are therefore needed.

Backlog Control and Work Prioritisation

Backlog is neither automatically good nor bad. A controlled backlog provides a pool of prepared work that can be selected when resources or production windows become available. An uncontrolled backlog contains obsolete requests, vague scopes, duplicate notifications, materials shortages and work that is no longer justified.

Backlog health can be examined by age, risk, readiness, craft, asset, estimated hours and reason for delay. Old work orders should be reviewed rather than carried indefinitely. Each item should be retained, reprioritised, replanned, converted into a project, or cancelled with a documented reason.

Useful categories include:

• safety, environmental and statutory work;
• corrective work required to restore a known defect;
• preventive and predictive work;
• improvement and reliability work;
• deferred work awaiting outage, material, engineering or access.

Backlog duration may be expressed as available labour hours divided by weekly capacity. This is only a rough indicator because the mix of skills and priorities matters. A large backlog of electrical work cannot be eliminated by adding unqualified mechanical labour. The aim is not zero backlog but a stable, risk-ranked and executable backlog.

Shutdown and Turnaround Planning

Shutdowns concentrate a large volume of work into a limited window. Their success depends on months of preparation, not on the intensity of activity during the outage. Scope freeze, work packaging, contractor mobilisation, materials, temporary facilities, permits, isolation plans, inspection points and restart criteria must be coordinated.

Shutdown scope should be challenged carefully. Every proposed task should have a clear basis: statutory requirement, known defect, preventive requirement, access advantage, modification or risk reduction. Adding low-value work late increases congestion and threatens critical-path activities. A work package should define the scope, sequence, resources, duration, constraints, quality requirements and acceptance criteria.

Critical-path analysis identifies activities that determine the minimum outage duration. Resource levelling prevents too many jobs competing for the same crane, specialist, inspector or process area. Daily shutdown meetings should review progress, safety, constraints, emerging scope and recovery actions. However, pressure to recover time must never remove essential isolation, inspection or testing steps.

A proper restart plan includes system walkdowns, removal of temporary equipment, restoration of guards and instruments, verification of line-up, leak testing, functional testing and operations acceptance. Post-shutdown review should compare planned and actual hours, scope growth, delays, quality defects and repeat failures.

Execution, Feedback and Work Closure

The supervisor converts the schedule into controlled field activity. Before work starts, the crew should understand the scope, hazards, isolation status, quality requirements and reporting expectations. Supervisors should monitor actual conditions rather than assuming the plan remains valid.

When the job differs materially from the plan, the team should pause and reassess. Examples include unexpected damage, wrong materials, unsafe access, changed process conditions or evidence of a different failure mode. Minor deviations may be managed within the approved method; changes affecting risk, scope, design or cost require appropriate authorisation.

Feedback should capture more than “completed.” A useful completion record includes actual labour hours, waiting time, materials used, measurements before and after, defects found, failure mechanism, cause if known, temporary repairs, recommendations and photographs where useful. Codes should be applied consistently so that data can support analysis.

Work closure should occur only after the asset is technically complete, the work area is restored, documentation is updated, permits are closed, operations accepts the equipment and follow-up actions are assigned. Premature closure hides incomplete work and distorts performance measures.

Measuring Work-Control Performance

Indicators should reveal whether the system is creating value, not encourage superficial activity. Important measures include:

• schedule compliance;
• percentage of planned work versus emergency work;
• ready backlog and total backlog by risk and age;
• wrench time or productive field time, interpreted carefully;
• planning accuracy for labour and duration;
• percentage of jobs delayed by materials, permits or access;
• preventive-maintenance compliance;
• repeat work and rework;
• overtime and contractor dependence;
• mean time to repair for relevant failure categories.

No single indicator is adequate. High wrench time may reflect poor preparation if quality falls. High preventive-maintenance compliance may result from closing tasks without effective inspection. Measures should therefore be balanced with safety, quality, reliability and stakeholder outcomes. Performance reviews should ask why results occurred and what system change is needed.

Digital Work Control and Emerging Practice

Computerised maintenance management systems and enterprise asset-management platforms provide the backbone for work identification, asset history, scheduling, materials control and reporting. Mobile devices allow technicians to receive work instructions, record readings, attach photographs and close jobs at the point of work. Integration with inventory, procurement, production planning and condition-monitoring systems reduces duplicate entry and improves visibility.

Analytics can identify chronic backlog growth, estimate job duration from historical work, detect repeat failures and forecast parts demand. Machine-learning models may assist prioritisation by identifying patterns associated with failure or delay, but their recommendations require engineering validation. Poorly coded historical data can produce confident but misleading results. Cybersecurity, access control, data ownership and system availability are essential because maintenance systems increasingly connect to operational technology.

Digitalisation should simplify decisions rather than automate weak processes. A mobile form cannot compensate for unclear ownership, poor asset hierarchy or undisciplined work-order closure. Successful implementation combines process design, data standards, user training and continuous review.

Illustrative Case: Stabilising Work Control in a Food-Processing Plant

Background

A fictional food-processing plant operated three production lines and used a central maintenance department. Although technicians were experienced, unplanned downtime had increased. The maintenance manager observed a growing backlog, frequent schedule changes and repeated shortages of bearings, belts and specialist contractors.

Situation and Analysis

A six-week review showed that 38 percent of weekly work was emergency or break-in work. Many planned jobs were not ready: some lacked materials, others required an outage not agreed with production, and several work requests were duplicates. Job descriptions were brief, and completion records often stated only “done.” Supervisors were measured mainly on the number of work orders closed, encouraging premature closure.

The team mapped the workflow and classified backlog by risk, readiness and age. It found that the apparent backlog included obsolete requests and 420 labour hours of work with missing parts. A critical conveyor gearbox had repeated failures, but no failure history was being analysed because technicians recorded different descriptions for the same problem.

Approach

Management introduced a screening meeting involving operations, maintenance and stores. Priorities were linked to food safety, personnel safety, production consequence and equipment condition. A planner was assigned to prepare job plans for recurring work and verify materials before scheduling. The weekly schedule was frozen two days before the work week, except for approved safety or production-critical changes.

Stores created reservations for scheduled materials, while operations committed specific access windows. Supervisors received a closure checklist requiring actual hours, parts used, defect found and functional test results. The gearbox work was analysed separately; inspection found misalignment and inadequate lubrication rather than a simple bearing problem. An alignment procedure and lubrication standard were added to the job plan.

Outcome

Within three planning cycles, the proportion of scheduled work completed as planned increased, material-related delays declined and the backlog became smaller but more credible. The plant did not eliminate emergency work, nor was that expected. Instead, it gained visibility of why emergency work occurred and could target chronic causes. The gearbox did not experience another repeat failure during the period reviewed.

Learning Points

The case demonstrates that work-control improvement is a system intervention. Adding technicians alone would not have solved unclear scope, missing materials or weak feedback. Reliable data, joint ownership with operations, readiness discipline and attention to failure causes were more important than simply increasing work-order volume.

Challenges, Risks and Professional Considerations

Common failures include scheduling non-ready work, allowing every request to become urgent, confusing labour hours with elapsed duration, failing to reserve materials, treating permits as paperwork, permitting uncontrolled scope growth and measuring closure rather than quality. Excessive planning can also become counterproductive when low-risk work is burdened with unnecessary approval layers. The appropriate level of control should reflect risk and complexity.

Ethically, maintenance managers must not manipulate priorities, completion codes or inspection records to improve reported performance. Deferring a safety-critical task without documented risk acceptance can expose workers and the organisation to serious harm. Contractor work requires the same standards of competence, supervision, isolation and reporting as employee work. Regulatory requirements concerning pressure equipment, electrical safety, environmental protection, lifting and confined spaces must be incorporated into the work system rather than treated as separate paperwork.

A professional work-control culture encourages technicians to stop unsafe work, report emerging defects and record unfavourable findings without fear of blame. Reliability improvement depends on truthful information. When production pressure conflicts with safety or statutory requirements, escalation and formal risk acceptance are necessary; informal concealment is not.

Best-Practice Framework

An effective maintenance work-control system generally follows these principles:

1. Make work identification specific, evidence-based and traceable to an asset.

2. Screen and prioritise by risk, not by organisational status or noise.

3. Plan work before assigning it to a crew.

4. Schedule only work that is genuinely ready.

5. Integrate maintenance, operations, stores, engineering and safety decisions.

6. Protect a short frozen schedule while retaining controlled emergency capacity.

7. Treat shutdowns as projects with defined scope, critical path and restart criteria.

8. Record useful technical feedback, not merely completion status.

9. Review backlog by risk, age, readiness and skill demand.

10. Use digital tools to strengthen disciplined processes and reliable data.

11. Measure safety, quality, reliability and schedule performance together.

12. Convert lessons from completed work into revised job plans and asset strategies.

Chapter Summary

Maintenance planning, scheduling and work control form an integrated closed-loop process. Work is identified, screened, prioritised, planned, authorised, scheduled, executed, documented and analysed. Planning removes uncertainty by defining scope, resources, materials, risks and acceptance criteria. Scheduling matches ready work with available capacity and operating windows. Work control maintains safe interfaces among maintenance, operations, stores, engineering, contractors and safety functions.

Backlog should be risk-ranked and actively governed, while shutdowns require long-range preparation, work packaging and critical-path control. Effective feedback records actual conditions and failure information so that preventive tasks, job plans, spares and reliability strategies can improve. Digital systems, mobile tools and analytics can enhance visibility, but they cannot replace sound processes, accurate data or professional judgement. The central managerial principle is to execute the right work safely and reliably, rather than merely increasing maintenance activity.

Key Terms

Work request: An initial notification describing a maintenance need or observed condition.

Work order: An authorised instruction defining work to be performed and controlled.

Job plan: A structured description of work steps, resources, hazards and acceptance requirements.

Backlog: Approved maintenance work that remains incomplete.

Ready backlog: Backlog for which scope, resources, materials and work conditions are available.

Break-in work: Unscheduled work inserted into an existing schedule.

Priority: The relative urgency or importance assigned to a work item.

Work screening: The process of validating, clarifying and classifying a work request.

Permit to work: Formal authorisation controlling specified hazardous work.

Energy isolation: Prevention and verification of release or transmission of hazardous energy.

Schedule compliance: The proportion of scheduled work completed within the planned period.

Frozen schedule: A protected scheduling period in which changes require approval.

Shutdown: A planned production stoppage for coordinated maintenance or related activities.

Critical path: The sequence of activities determining the minimum project or outage duration.

Scope growth: Expansion of authorised work beyond the original definition.

Feedback: Technical and operational information recorded after work execution.

Wrench time: The proportion of available field time spent directly performing maintenance tasks.

Work control: The governance of maintenance work from identification through closure and learning.

Condition monitoring: Measurement of asset condition to identify developing degradation.

Failure mechanism: The physical or chemical process through which an asset loses required function.

Review Questions

Short Answer Questions

1. Distinguish maintenance planning from maintenance scheduling.

2. What information should be included in a high-quality work request?

3. Define ready backlog and explain its importance.

4. Why should labour hours be distinguished from elapsed job duration?

5. What types of information should be recorded during work closure?

Long Answer Questions

1. Explain the complete maintenance work-control workflow from identification to continuous improvement.

2. Discuss how permits, energy isolation and operations interfaces should be incorporated into job planning.

3. Explain the principles of weekly scheduling, frozen schedules and controlled break-in work.

4. Describe the major planning and coordination requirements of a maintenance shutdown.

5. Evaluate the role of backlog management and performance indicators in improving maintenance effectiveness.

Analytical / Application Questions

1. A plant has high schedule compliance but increasing equipment failures and repeat work. Analyse possible reasons and recommend a revised performance-control approach.

2. A critical pump repair is scheduled, but the required seal is unavailable and production has not confirmed an outage window. Decide whether the job should be scheduled and explain the controls you would apply.

3. Design a prioritisation and work-control process for a process plant receiving safety observations, predictive-maintenance alerts, breakdown notifications and improvement proposals simultaneously.

22. Multiple Choice Questions with Answers

Question 1

Which condition most appropriately defines a maintenance job as ready for scheduling?

A. The work request has been entered into the maintenance system.

B. The supervisor expects that required resources can be found during execution.

C. Scope, resources, materials, work conditions and required controls have been established.

D. The job has the highest estimated labour hours.

Correct Answer: C. Scope, resources, materials, work conditions and required controls have been established.

Question 2

A work request states only “motor noisy.” What is the most appropriate first improvement?

A. Classify it automatically as emergency work.

B. Obtain specific evidence such as asset identity, symptoms, measurements and operational effect.

C. Replace the motor before further investigation.

D. Cancel the request because the cause is unknown.

Correct Answer: B. Obtain specific evidence such as asset identity, symptoms, measurements and operational effect.

Question 3

Why is a frozen period useful in a weekly maintenance schedule?

A. It prevents all emergency work under every circumstance.

B. It ensures that only preventive maintenance is performed.

C. It limits uncontrolled changes and makes schedule performance meaningful.

D. It allows planners to avoid coordination with operations.

Correct Answer: C. It limits uncontrolled changes and makes schedule performance meaningful.

Question 4

Which practice best supports effective backlog control?

A. Retaining every work order permanently for historical visibility.

B. Ranking backlog by risk, age, readiness, skill and reason for delay.

C. Closing old work orders without review.

D. Measuring backlog only by the number of work orders.

Correct Answer: B. Ranking backlog by risk, age, readiness, skill and reason for delay.

Question 5

During a repair, technicians discover damage outside the approved scope. What should normally happen?

A. The crew should continue without reporting it to protect schedule compliance.

B. The additional work should be assessed and authorised according to its risk and impact.

C. The entire work order should be deleted.

D. The technicians should record the original scope as completed and ignore the damage.

Correct Answer: B. The additional work should be assessed and authorised according to its risk and impact.

Question 6

Which statement best describes the relationship between a permit to work and a risk assessment?

A. A permit eliminates the need for a risk assessment.

B. A risk assessment is unnecessary when a permit exists.

C. They are complementary controls; neither substitutes for sound planning and verification.

D. A permit is required only after the job has been completed.

Correct Answer: C. They are complementary controls; neither substitutes for sound planning and verification.

Question 7

What is the principal purpose of recording actual labour, materials, measurements and failure information after a job?

A. To increase the apparent number of closed work orders.

B. To support learning, future planning and reliability improvement.

C. To eliminate the need for preventive maintenance.

D. To justify all overtime automatically.

Correct Answer: B. To support learning, future planning and reliability improvement.

Question 8

A shutdown team adds several low-value jobs late in the outage preparation period. What is the principal risk?

A. Reduced need for work packaging.

B. Scope growth, congestion and threat to critical-path activities.

C. Improved certainty of the outage duration.

D. Automatic reduction in contractor requirements.

Correct Answer: B. Scope growth, congestion and threat to critical-path activities.

Question 9

Which measure should be interpreted cautiously because high values may conceal poor quality or inaccurate reporting?

A. Work-order closure count alone.

B. Number of statutory requirements.

C. Number of asset locations.

D. Number of operating shifts.

Correct Answer: A. Work-order closure count alone.

Question 10

What is an appropriate role for analytics or machine learning in maintenance work control?

A. Replacing all engineering judgement in priority decisions.

B. Identifying patterns in failure, duration or materials demand while requiring validation.

C. Allowing incomplete historical data to determine safety-critical actions automatically.

D. Removing the need for accurate asset hierarchies.

Correct Answer: B. Identifying patterns in failure, duration or materials demand while requiring validation.