The GARPI Methodology Report documents the research design, dimensional framework, scoring model, maturity classification system and statistical validation approach behind the Global Asset Reliability & Performance Index.
What the report covers
Free to download · No payment required · Developed by Optimal
The Global Asset Reliability & Performance Index (GARPI) is an annual benchmark study developed by Optimal to measure the maturity and effectiveness of asset performance management (APM) practices across global asset-intensive industries.
This report documents the theoretical foundation, research design, dimensional framework, scoring model, maturity classification system and statistical validation approach underpinning the GARPI index. It is published to provide full transparency to participating organisations, independent researchers and industry practitioners.
GARPI is designed to measure how effectively asset-intensive organisations translate reliability and maintenance practices into operational performance and lifecycle value. It does not assess individual assets or sites — it benchmarks the organisational systems, processes, governance structures and capabilities that determine how well an organisation manages its asset base.
The index is intended to serve three audiences: practitioners seeking objective evidence of where their organisation stands relative to peers; leadership teams requiring board-level evidence of asset management maturity; and the industry as a whole, through the publication of anonymised aggregate findings.
The GARPI framework is explicitly mapped to two internationally recognised standards: ISO 55001:2014 (Asset Management — Management Systems — Requirements) and the GFMAM Asset Management Landscape (3rd Edition).
| ISO 55001 Clause | Focus Area | GARPI Dimension |
|---|---|---|
| Clause 5 — Leadership | Leadership and commitment, policy, roles | Reliability Governance |
| Clause 6 — Planning | Risks, opportunities, asset management objectives | Strategic Outlook |
| Clause 7 — Support | Competence, awareness, communication | Workforce Capability |
| Clause 8 — Operation | Operational planning, lifecycle activities | Maintenance Strategy; Spares & Materials |
| GFMAM Subject Group | GARPI Dimension |
|---|---|
| Physical Asset Management | Asset Performance Outcomes |
| Organisational & Strategic | Reliability Governance; Strategic Outlook |
| Lifecycle Delivery | Maintenance Strategy; Spares & Materials |
| Asset Information | Data & Digital Capability |
| Value Realisation | Lifecycle Value & Financial Alignment |
| Organisational Enablers | Workforce Capability |
The GARPI composite index comprises eight dimensions, each measuring a distinct domain of asset performance management. Weightings reflect the relative impact of each dimension on overall reliability and operational performance outcomes, informed by practitioner consensus and alignment with ISO 55001 requirements.
| # | Dimension | Weight | Standards Alignment |
|---|---|---|---|
| 1 | Asset Performance Outcomes | 25% | GFMAM Physical Asset Management |
| 2 | Reliability Governance | 15% | ISO 55001 Clause 5 |
| 3 | Maintenance Strategy & Execution | 15% | ISO 55001 Clause 8 |
| 4 | Data & Digital Capability | 12% | GFMAM Asset Information |
| 5 | Lifecycle Value & Financial Alignment | 13% | GFMAM Value Realisation |
| 6 | Workforce Capability & Knowledge Mgmt | 10% | ISO 55001 Clause 7 |
| 7 | Spares & Materials Management | 5% | GFMAM Lifecycle Delivery Enablers |
| 8 | Strategic Outlook | 5% | ISO 55001 Clause 6 |
This dimension was introduced in 2026 in direct response to ISO 55001 Clause 7's requirement that organisations determine, provide and maintain the competencies necessary for effective asset management. It covers structured competency frameworks, formal training programmes, knowledge retention mechanisms and contractor capability governance.
This dimension was added following recognition that spares availability is a critical, frequently overlooked enabler of maintenance execution — particularly in mining, oil & gas and heavy process industries where long lead times and remote locations amplify the impact of stock-outs on unplanned downtime.
Maturity statements are scored on a five-point Likert scale. Operational performance indicators are scored based on declared values against calibrated industry ranges. Each dimension score is calculated as the mean of its constituent item scores, normalised to a 0–100 scale.
| Score | Label | Description |
|---|---|---|
| 1 | Not in place | No evidence of this practice |
| 2 | Informal / ad hoc | Activity occurs but inconsistently; no defined process |
| 3 | Defined | Documented process exists; applied in most areas |
| 4 | Managed | Consistently applied; measured and reviewed |
| 5 | Optimised | Continuously improved; fully integrated; industry-leading |
The resulting composite score ranges from 0 to 100. A score of 100 represents theoretical perfection — consistent Level 5 performance across all dimensions. In practice, top-quartile organisations are expected to score in the 75–90 range.
Composite GARPI scores are mapped to five maturity tiers, each characterised by a distinct profile of organisational behaviour, governance quality and performance outcome. Each tier is also contextualised against ISO 55001 readiness.
| Score Range | Tier | Characterisation | ISO 55001 Readiness |
|---|---|---|---|
| 85–100 | Reliability Leader | Data-driven, financially integrated, continuous improvement culture | Highly aligned; likely certification-ready |
| 70–84 | Advanced | Systematic practices, proactive maintenance, clear financial linkage | Strong alignment with some gaps |
| 55–69 | Emerging | Defined processes; inconsistent application; shifting from reactive | Partial alignment; structured improvement needed |
| 40–54 | Reactive | Predominantly corrective; limited governance and data utilisation | Limited alignment; significant gap to close |
| < 40 | Firefighting | Unstructured, high reactive burden; critical gaps across dimensions | Not aligned; foundational work required |
GARPI targets 200–300 complete responses per annual cycle to support statistically robust industry-level benchmarks and meaningful subgroup analysis. Responses are solicited from senior practitioners across asset-intensive industries globally, via direct outreach, professional networks and industry association partnerships.
| Subgroup Size | Reporting Treatment |
|---|---|
| 25+ | Full subgroup benchmark reported |
| 15–24 | Indicative results reported with caution note |
| < 15 | Aggregated into broader category; not reported separately |
Priority respondents are senior practitioners with direct accountability for asset performance outcomes: Operations Directors, Asset Managers, Reliability Engineers, Maintenance Managers, Heads of Engineering, and C-Suite leaders in asset-intensive organisations. Minimum organisational size: 250 employees. Minimum asset base: one major operational facility.
GARPI applies standard psychometric and quantitative validation procedures to ensure the reliability and validity of the index across annual cycles.
Cronbach's alpha is calculated for each dimension and for the composite index. A minimum threshold of α = 0.70 is required for a dimension to be reported. Dimensions falling below threshold are reviewed and revised before the following cycle.
Exploratory factor analysis is conducted to confirm that items load on their intended dimensions and that dimensions are conceptually distinct. Cross-analysis between GARPI scores and declared operational performance indicators (availability, reactive maintenance %, downtime cost) is used to assess convergent validity.
| Control | Procedure |
|---|---|
| Incomplete responses | Excluded if more than 20% of maturity items are unanswered |
| Implausible completion time | Responses completed in under 90 seconds flagged and reviewed |
| Duplicate entries | Email + organisation combination deduplicated; most recent retained |
| Straight-lining | Responses with identical ratings on all items reviewed for validity |
All survey responses are collected anonymously. Identifiable information provided in the benchmark report opt-in (name, organisation, email) is held securely by Optimal and never included in published findings. Results are reported in aggregated form only, subject to minimum reporting thresholds.
GARPI is developed and administered independently by Optimal. It is not sponsored by, affiliated with, or commercially linked to any APM software vendor, technology supplier or consulting firm. This independence is a fundamental design principle of the index.
The core dimensional framework and scoring model are held stable across annual cycles to enable year-on-year comparison. Material changes to the framework are documented in a revision log and flagged in benchmark reports to ensure longitudinal comparability is not compromised.
For enquiries regarding the GARPI methodology, data governance or research partnerships, contact Optimal at optimal.world.
Take the GARPI survey — six minutes, free benchmark report, your organisation compared with global peers.