Optimal› What We Do› Obsolescence Studies
04.06 · Advisory & Optimisation

The supplier stopped making it.
You have three years of stock left.
Do you know which assets?

Obsolescence is not a future risk — it is a present condition that most asset-intensive organisations are not tracking systematically. Components become obsolete. Suppliers exit markets. Software loses support. Skills retire. Every one of these represents an unplanned operational event waiting to happen. Optimal's Obsolescence Study identifies what is at risk, quantifies the consequence and lead time, and delivers a structured mitigation strategy before the event forces your hand.

Discuss your asset base → See how the study works
IEC 62402
International obsolescence management standard — study aligned
7-Step
Structured risk assessment process — system through component
10 Types
Skills, software, mechanical, electronic, materials and more
Standalone
Or embedded within the ARaaS® programme
Why This Cannot Wait

Obsolescence is discovered
too late or not at all.

Most organisations discover obsolescence in one of two ways: a supplier announces end-of-life with a last-time buy window, or an asset fails and the replacement part no longer exists. Both are reactive. Both carry costs that a structured programme would have materially reduced or eliminated.

01
A supplier has issued an end-of-life notice
A last-time buy window gives the organisation a finite period to act — but acting intelligently requires knowing which assets depend on the component, what the failure consequence is, what stock exists and what the resolution options are. Without a structured study, the decision is made under pressure with incomplete information. The wrong quantity is bought, or the wrong mitigation is selected.
02
Aging plant is approaching its designed life
Assets designed and commissioned in the 1980s and 1990s carry components — electronic control systems, specialist mechanical assemblies, safety-critical instruments — whose manufacturers are no longer trading or have long moved on to successor products. The asset functions today. The question is whether it can be supported through its next planned operating period.
03
A capital project is extending the operational life of an asset
A life extension decision commits the organisation to operating the asset for a further decade. An obsolescence study at the point of that decision reveals which components will need to be addressed within the extension period — allowing last-time buys, redesigns and alternative sourcing strategies to be planned and budgeted before the extension commits, not discovered during it.
04
Control system software is losing vendor support
Software obsolescence carries unique risk in operational technology environments — loss of vendor support means loss of security patching, which creates cyber vulnerability alongside operational supportability risk. In regulated environments, unsupported software on safety-critical control systems is a compliance finding, not just a maintenance problem.
The Cost of Reactive Management
What happens when obsolescence is discovered too late
Major Redesign
The most expensive resolution — typically required when no component-level mitigation is available. Costs are orders of magnitude higher than a structured last-time buy or alternative sourcing programme initiated before the window closed.
Cannibalisation
Removing working components from one asset to sustain another — operationally damaging, expensive to manage, and a signal that obsolescence was not identified before the supply chain dried up. A last resort that a proactive study prevents.
Extended Outage
When a critical component fails and no replacement exists, the outage duration is determined by the lead time of the redesign or alternative sourcing effort — potentially weeks or months, not hours or days. In power generation and oil & gas, the production loss dwarfs the cost of the study many times over.
Cyber Exposure
Software and firmware obsolescence on operational technology — SCADA, DCS, safety systems — creates an attack surface that cannot be patched without vendor support. In critical national infrastructure, this is both a regulatory and national security concern.
"

"Obsolescence is inevitable and cannot be avoided — but forethought and careful planning can minimise its impact and its potentially high costs. The objective of obsolescence management is to ensure that obsolescence is managed as an integral part of design, development, production and in-service support."

IEC 62402:2019 — International Standard for Obsolescence Management · adapted by Optimal
What Becomes Obsolete

Ten types of obsolescence.
Most organisations track one.

Component obsolescence is the most visible type — but it is not the only one that carries operational risk. A comprehensive Obsolescence Study considers all ten categories, because a mitigation strategy for a mechanical component may still fail if the skill to install it has retired, or the test equipment to verify it is no longer available.

⚙
Mechanical Components
Specialised mechanical assemblies, custom-machined parts, proprietary couplings and precision components from suppliers who have exited the market or discontinued production. Often the longest lead time for redesign alternatives.
⚡
Electronic Components
Integrated circuits, microprocessors, programmable logic controllers and PCB assemblies with short product life cycles — particularly custom or cutting-edge components with single-source supply and no backwards compatibility.
💾
Software & Firmware
Control system software, SCADA platforms, DCS firmware and safety system software losing vendor support. Loss of support means loss of patches — creating cyber vulnerability alongside operational supportability risk.
🔧
Tools & Test Equipment
Specialist maintenance tools, calibration equipment and diagnostic instruments tied to specific asset generations. When the asset can no longer be tested or calibrated, it cannot be maintained to the required standard.
📋
Documentation
Original equipment manuals, design drawings, maintenance procedures and engineering records — particularly for assets where the original manufacturer no longer exists. Loss of technical documentation is often irreversible.
⚗
Materials
Specialist materials — alloys, coatings, lubricants, sealing compounds — discontinued by manufacturers or restricted by regulatory change. Often overlooked until a maintenance procedure cannot be completed to specification.
🔄
Processes
Manufacturing and maintenance processes no longer supported commercially — specialist welding techniques, heat treatment processes or surface finishing procedures tied to discontinued industrial capability.
👤
Skills & People
Expertise held by individuals approaching retirement — knowledge of legacy systems, specialist maintenance techniques and institutional memory that has never been documented. Skills obsolescence is the hardest to reverse once it has occurred.
🏭
Supplier & Supply Chain
Suppliers ceasing trading, being acquired, relocating production or changing their product range — leaving single-source dependencies without an alternative. Supply chain obsolescence often creates obsolescence across all other categories simultaneously.
🖥
Testing & Calibration Equipment
Dedicated test rigs, functional test equipment and calibration references specific to asset generations. When the test equipment is obsolete, the asset cannot be verified — regardless of whether the asset itself remains functional.
Where Your Organisation Sits Today

Five levels of obsolescence
management maturity.

Most asset-intensive organisations operate at Level 1 or 2 — responding to obsolescence events as they occur. Optimal's Obsolescence Study moves the organisation to Level 3 or above — where obsolescence is identified and managed before it disrupts operations. The study itself is the transition mechanism.

1
Reactive
Deal with obsolescence issues as they arise
No structured obsolescence management. End-of-life notifications are frequently missed. Obsolescence is discovered when a component fails or a replacement cannot be sourced. Resolution is by emergency — whatever can be obtained most quickly, regardless of cost or consequence. The most expensive and most operationally disruptive position to occupy.
2
Reactive
Reactive, but making last-time buys when notified
Supplier end-of-life notifications are acted on when received — but without structured analysis of which components to prioritise, what quantities to purchase or what the downstream consequences of inaction would be. Last-time buys are made on instinct rather than criticality analysis. Proactive monitoring is absent.
3
Optimal Study Outcome
Structured monitoring — proactive notification on key components
An Obsolescence Study has been completed. Critical components are identified. Obsolescence monitoring is in place for high-risk items. Key parts are managed proactively — with last-time buy decisions informed by criticality analysis, lead time assessment and consequence modelling. The organisation is no longer surprised by obsolescence events for its critical assets.
4
Proactive
Technology roadmapping with supplier partnering or design consideration
Ongoing technology roadmapping across the critical asset base. Supplier partnering agreements to secure advance notification and priority access. Either design-stage obsolescence consideration or formal supplier partnering — but not yet both simultaneously. The organisation is shaping its obsolescence profile, not just managing it.
5
Fully Proactive
Technology roadmapping, supplier partnering and design-stage obsolescence
The highest level of obsolescence management maturity. Technology roadmapping across all critical domains. Formal supplier partnering agreements with advance notification commitments. Obsolescence designed out at the specification stage — through modularity, multi-sourced components and technology transparency requirements. The organisation's asset base is structured to minimise future obsolescence exposure.
How Optimal Conducts the Study

Seven steps from system
to risk-registered component.

Optimal's Obsolescence Study follows a structured seven-step risk assessment process — working from the system level down to individual components, assessing risk at each level and producing a prioritised mitigation plan that reflects consequence, lead time and resolution cost.

01
System Support Plan Assessment
Review of the existing System Support Plan — understanding the operational context, the planned service life of each system, the maintenance regime in place and the existing obsolescence-related documentation. Establishes the scope boundary and identifies systems where obsolescence risk is greatest relative to planned service life. The assessment sets the context within which all subsequent steps operate.
02
Resources Planning
Identification of the data sources, subject matter expertise, supplier contacts and internal stakeholders required to conduct the study effectively. For large asset bases, a prioritisation methodology is applied to focus effort where consequence of obsolescence is highest — ensuring the study delivers maximum risk reduction within the available resource envelope.
03
Extract & Filter Bill of Materials
Extraction of the complete Bill of Materials from the CMMS, EAM system or engineering records — then systematic filtering to focus on components where obsolescence risk is material. Filtering criteria include component age, technology type, supplier status, single-source dependency and safety or production criticality. The filtered BoM is the working scope for Steps 4 and 5.
04
Risk Analysis for Each Component
Individual risk assessment for each component in the filtered BoM — evaluating: the probability of obsolescence within the planned service life; the consequence of failure to source; the lead time for resolution options; the component complexity level (high, medium, low) which determines the range of viable resolutions; and the requalification requirement if an alternative is selected. The risk assessment produces an individual risk score and resolution complexity classification for each component.
05
Component Prioritisation & Mitigation Decisions
Risk scores aggregated into a prioritised action list — components ranked by the combination of consequence, probability and lead time. For each prioritised component, a specific mitigation strategy is recommended: existing stock utilisation, last-time buy, authorised aftermarket sourcing, equivalent or alternate sourcing (Form, Fit, Function replacement), emulation, or redesign (minor or major). The recommendation accounts for component complexity, requalification requirements and budget implications.
06
Risk Register Update
All identified obsolescence risks — assessed, prioritised and with mitigation strategies assigned — entered into the organisation's risk register or, where none exists, into Optimal's structured Obsolescence Risk Register deliverable. Each entry includes: component identification, risk score, consequence description, mitigation strategy, responsible owner, action deadline and review date. The register is the governance instrument for tracking mitigation progress.
07
Review
A structured review of the completed study against the original scope — confirming coverage, validating the risk scores against available evidence, reviewing the mitigation strategies with relevant stakeholders and agreeing the implementation priorities and timescales. For ongoing managed programmes within ARaaS®, this step establishes the review cadence — the frequency at which the risk register is updated as new obsolescence intelligence becomes available.
Mitigation Strategies

Eight resolution options.
The right one depends on complexity.

Not all obsolescence problems have the same solution. The appropriate resolution depends on the component's complexity level, the consequence of obsolescence, the lead time available and the requalification requirement. Optimal selects and sequences mitigation strategies based on this assessment — not on what is most convenient to recommend.

Same Component — Source & Secure
Preserve the existing specification
Where the original component can still be obtained — through existing stock, a last-time buy, cannibalisation of decommissioned assets, or authorised aftermarket sources — the original specification is preserved. This is always the lowest-risk option where it remains viable, and the one that should be evaluated first.
Existing stock — utilise holdings already in stores
Last-time buy — acquire calculated stock before window closes
Reclamation / cannibalisation — recover from decommissioned assets
Authorised aftermarket — qualified non-OEM equivalent sources
FFF Replacement — Form, Fit, Function
Alternative component to the same specification
Where the original component is no longer obtainable, a Form, Fit, Function replacement may exist — a component from an alternative manufacturer that meets the same technical specification and can be installed without modification. Applies most readily to low and medium complexity components with multiple sources. Requalification requirements must be assessed for each application.
Alternate — different manufacturer, equivalent specification
Equivalent — functionally equivalent with minor parameter differences
Emulation — functional replication using different technology
Redesign — Change the Design
Modify the assembly or system
Where no component-level solution is viable, a redesign is required — either of the component interface (minor redesign) or of the wider assembly or system architecture (major redesign). This is the most expensive and longest lead-time resolution and should only be reached after all lower-complexity options have been exhausted. Requalification is invariably required. Early identification through a structured study is the only way to execute a redesign before the asset becomes unoperational.
Minor redesign — component interface or mounting modification
Major redesign — sub-system or system architecture change
What Optimal Delivers

A study that produces
decisions, not just findings.

Obsolescence studies that produce a list of at-risk components without recommending what to do about them, with what urgency and at what cost, are a common and expensive failure. Optimal's study outputs are structured for implementation — each finding is accompanied by a recommended mitigation, a priority and an owner.

The study can be delivered as a standalone engagement — a defined scope, timeline and set of deliverables — or as a continuous managed programme within ARaaS®, where the Obsolescence Risk Register is maintained and updated as new intelligence becomes available and as the asset base evolves.

For organisations operating under IEC 62402:2019, Optimal's study outputs are structured to support the Obsolescence Management Plan (OMP) requirement — providing the documented evidence base that the standard requires.

Primary Deliverable
Obsolescence Risk Register
A structured register of all identified obsolescence risks — each with: component identification, system context, risk score (probability × consequence), lead time assessment, complexity classification, recommended mitigation strategy, estimated cost band, responsible owner and action deadline. Formatted for direct integration with the organisation's existing risk management framework or CMMS.
Primary Deliverable
Obsolescence Mitigation Strategy
A prioritised, costed action plan specifying the recommended mitigation for each at-risk component — last-time buy quantities, alternative sourcing routes, emulation feasibility assessments and redesign scope definitions where required. Each recommendation includes the decision deadline — the latest point at which the mitigation can still be executed within budget and before operational impact. The strategy converts risk register findings into a capital and procurement plan.
Supporting Deliverable
Lifecycle Extension Assessment
For assets subject to life extension decisions, a specific assessment of which obsolescence risks are manageable within the extended life and which represent constraints on the extension period. The assessment provides the evidence base for the capital investment decision — confirming what additional investment is required to make the life extension viable, and identifying any components for which no viable solution exists within the extension period.
Supporting Deliverable
Obsolescence Management Plan (OMP)
For organisations required to operate under IEC 62402:2019, Optimal produces an Obsolescence Management Plan covering governance structure, monitoring approach, resolution process and performance metrics. The OMP documents how the organisation will manage obsolescence as an ongoing operational discipline — not as a series of one-off reactions — and provides the evidence that IEC 62402 compliance requires.
Key Industries

Where obsolescence risk
is highest and least managed

Long asset lives, complex technology stacks, aging installed base and high consequence of operational failure combine in these industries to create acute — and frequently underestimated — obsolescence exposure.

Oil & Gas · Upstream & Midstream
Oil & Gas
Offshore platforms and onshore process facilities carrying control systems, safety instrumented systems and mechanical assemblies from the 1980s and 1990s — often maintained on extended life well beyond their original design basis. Electronic control cards, DCS platforms, safety PLCs and specialist rotating equipment components are the highest-exposure categories. Unplanned outages in offshore environments carry both extreme production cost and logistics complexity.
DCS / SISSafety criticalExtended lifeOffshore
Power & Utilities · Generation & Distribution
Power Generation & Utilities
Power generation assets — conventional thermal, hydro, renewable — operate across asset lives of 30–60 years with control systems, protection relays and specialist mechanical components that have long since been discontinued by their original manufacturers. Grid-connected assets face regulatory obligations around availability that make unplanned obsolescence events a compliance matter as well as an operational one. Utility network infrastructure carries similar long-life exposure in switchgear, SCADA and protection systems.
Long asset lifeProtection systemsRegulatory availabilitySCADA
Nuclear · Highly Regulated
Nuclear
Nuclear facilities carry some of the most acute obsolescence exposure of any industry — assets with 40–60 year operational lives, safety-critical instrumentation and control systems, and regulatory requirements that make component changes subject to formal change control and requalification. Obsolescence management is a regulatory expectation, not a business choice. The consequence of inadequate management is not just operational disruption but regulatory enforcement.
Regulatory requirementSafety criticalRequalificationI&C systems
Mining & Metals · Remote Operations
Mining & Metals
Mining operations in remote locations face a compounded obsolescence challenge — long equipment life cycles, limited access to specialist suppliers, and supply chains that are already extended compared to industrial facilities in developed markets. Single-source mechanical components on high-value production equipment create concentrated risk. The production cost of a prolonged outage waiting for a redesigned component to arrive in a remote African mine is substantial.
Remote locationsSingle-sourceLong lead timesAfrica
Chemical & Process · Continuous Operations
Chemical & Process Manufacturing
Continuous process plants — fertiliser, petrochemical, specialty chemical — operate with high unplanned outage cost and often with specialist control systems and proprietary measurement technology tied to specific asset generations. Process safety requirements add a requalification dimension to any component change, making proactive obsolescence management essential for maintaining both operational continuity and safety case integrity.
Continuous processSafety caseRequalificationProprietary systems
Pharma & Life Sciences · GxP Regulated
Pharmaceutical & Life Sciences
GxP-regulated manufacturing environments carry a unique obsolescence burden — any component change on qualified equipment triggers a change control and potential requalification programme, which takes time and resource. Obsolescence identified early allows requalification to be planned as a managed activity. Obsolescence discovered during a regulatory inspection, or during a batch failure investigation, is a significantly more serious event.
GxP / GMPChange controlRequalificationFDA / EMA
Governing Standard
IEC 62402:2019 — International Standard for Obsolescence Management
IEC 62402:2019 is the only generic international standard specifically addressing obsolescence management. It provides requirements and guidance applicable to any organisation across all life cycle phases — covering governance, planning, monitoring, resolution and performance measurement. Optimal's Obsolescence Study methodology is structured to align with IEC 62402:2019 requirements, ensuring the study outputs contribute directly to an Obsolescence Management Plan that meets the standard's documentation requirements. For organisations in regulated industries where IEC 62402 compliance is expected — oil and gas, nuclear, defence — this alignment removes a separate compliance burden from the study scope.
IEC 62402Obsolescence Management Standard · 2019

Which of your critical assets
are already at risk?

Every engagement starts with a scoping conversation — understanding your asset base, your planned service lives, your current obsolescence monitoring capability and your highest-consequence systems. We will tell you honestly what a structured study involves, what it will find and what it will cost. No obligation and no proposal before the conversation.

Start the conversation Understand the ARaaS® framework
Related Capabilities

Often delivered
alongside this study

04.04 · Advisory & Optimisation
Asset Data Cleansing & Enrichment
An Obsolescence Study is only as good as the Bill of Materials it starts from. Where the asset register is incomplete, incorrectly classified or missing OEM references, data cleansing and enrichment is a prerequisite — ensuring the study covers the actual asset base rather than a partial or inaccurate view of it.
Learn more →
Operations & Maintenance
Spares & Inventory Optimisation
Last-time buy decisions produce inventory that must then be managed correctly — stored to preservation requirements, tracked against consumption and reviewed as the mitigation period progresses. Optimal's spares optimisation capability provides the inventory management framework that the obsolescence mitigation strategy requires.
Learn more →
ARaaS® Framework
Asset Reliability as a Service
An Obsolescence Study embedded within ARaaS® becomes a continuous managed programme — the risk register is maintained, monitoring is ongoing and new intelligence feeds into the mitigation plan as it becomes available. A one-time study protects you today. A continuous programme keeps you protected.
Understand ARaaS® →
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