Key Takeaways
- A ten-year analysis of 73 Independent Project Reviews across mining, infrastructure, and energy found that the majority of issues were systemic and fixable, but only when surfaced before approval. Capital estimating is the highest-concentration failure zone: thin basis-of-estimate documentation, excessive allowances, and contingency that cannot be independently defended.
- IPA's research shows that only 16% of capital projects enter authorisation with Best Practical FEL, and that the average project loses 22% of expected net present value at the authorisation decision itself - before execution begins.
- Lovallo and Kahneman's foundational research on optimism bias in executive decision-making establishes that internal teams systematically adopt an "inside view" that discounts base-rate performance of comparable projects. The UK Treasury mandates 44-66% uplifts on civil engineering capex at outline business case - reductions are only permitted where mitigation is independently verified.
- McKinsey's analysis of distressed capital programmes found that functional leaders consistently resisted independent reviews, on the same portfolio that averaged cost overruns of approximately 80% and schedule delays of approximately 50%.
- Project assurance and project management are structurally distinct functions with different accountability lines. The APM defines assurance as independent, objective, and proportionate - designed to tell stakeholders what they need to know, not what the delivery team believes to be true.
When a capital project reaches Final Investment Decision, the Board has typically seen a business case, a risk register, a cost estimate, and a schedule. What it has rarely seen is an independent challenge to any of them.
A ten-year study of 73 Independent Project Reviews across mining, infrastructure, and energy, published in February 2026, found that the majority of issues in those projects were systemic and fixable, but only when surfaced before approval. Not during execution. Not at the first cost reforecast. Before the investment decision. The same study identified capital estimating as the highest-concentration failure zone: thin basis-of-estimate provenance, excessive allowances, weak benchmarking, and contingency that is neither structured nor independently defensible. These are not unusual conditions. They are the standard conditions under which most EMR capital projects reach FID.
With an exceptional concentration of capital approaching investment decision across the sector in 2025 and 2026 - from LNG in North America to copper and lithium across the Americas to upstream oil and gas in the Middle East - who challenges project assumptions before they are locked into an approval decision is a governance question with direct financial consequences.
What Does a Decade of Independent Project Reviews Actually Show?
The ten-year analysis of 73 Independent Project Reviews produced 1,266 findings, harmonised across a 20-discipline taxonomy and filtered to High, Significant, and Medium severity. The distribution is consistent across sectors. Capital estimating issues dominate. A second band of findings covers scope definition, engineering quality, and schedule realism. Operational readiness - when addressed at all - tends to be late, generic, and under-resourced relative to the complexity of the asset being commissioned.
The study's central finding is the one with the most direct governance implication: most issues are systemic and fixable if surfaced and closed before approval. A smaller set of high-severity items - gaps in constructability, unsigned baselines, and procurement strategies that have not been tested against market conditions - must be resolved at the approval milestone itself. After that point, the cost of correction rises steeply and non-linearly. IPA's benchmarking data quantifies the gap: projects in the bottom quartile of Front-End Loading quality are typically 20-40% more expensive and 30-45% slower to deliver than those in the top quartile - for identical scope. That gap is not created during construction. It is locked in before the first contract is signed.
Why Do Internal Teams Consistently Miss What External Reviews Find?
The answer is cognitive, not a question of individual capability.
Lovallo and Kahneman's research on optimism bias in executive decision-making identified the mechanism: internal teams adopt an "inside view" anchored to the specifics of their project - its team, its assumptions, its plan. The "outside view" - the base-rate performance of comparable projects across the industry - is systematically discounted. The team is not being dishonest. It is applying exactly the cognitive approach that feels most responsible and rigorous.
The UK Treasury's response to this finding is direct. The Green Book mandates optimism bias uplifts of 44-66% on civil engineering capital expenditure at outline business case stage. These uplifts can only be reduced where evidence of mitigation is independently verified. Self-certification does not meet the standard.
Bent Flyvbjerg's research at Oxford, drawing on more than 16,000 projects across 20 countries and seven decades, adds a harder layer. Only 8.5% of megaprojects meet their cost and schedule targets. A mere 0.5% deliver all their promised benefits. His analysis distinguishes optimism bias from strategic misrepresentation, the deliberate shaping of estimates to secure approval. The two are not always easy to separate from inside the delivery chain. From outside it, the pattern tends to be more legible.
The distortion compounds as information travels upward. Internal project reports have a consistent tendency to improve with each layer of management review. McKinsey's analysis of distressed capital programmes documented that functional and business leaders were resistant to independent reviews, particularly external ones, on the same portfolio that averaged cost overruns of around 80% and schedule delays of around 50%. The resistance and the outcome are connected.
What Is the Difference Between Project Assurance and Project Management?
They are structurally different functions with different accountability lines - and conflating them is one of the most common sources of governance gaps in capital programmes.
Project management owns delivery. The project director is responsible for planning, executing, and controlling the work within the constraints set at sanction. That accountability runs to the project.
Project assurance is independent of that delivery chain. The APM defines it as the function that provides confidence to the sponsoring organisation that a project is likely to achieve its intended objectives - independent, objective, and proportionate to the risk. The operational distinction is precise: performance management tells you how the team thinks it is doing; assurance tells you what stakeholders need to know. Those are not the same question, and on a distressed capital programme, the answers frequently diverge.
IPA Global is direct about why independence is non-negotiable at the gate: "It is almost impossible for a business unit within a corporation to effectively police the FEL 1 gate by itself. There are simply too many forces that undermine the discipline." The Three Lines of Defence model - standard across APM, Axelos, and major governance frameworks - places independent assurance structurally outside the delivery chain for precisely this reason. Its judgement is only credible where it is uncontaminated by delivery pressure. For a detailed examination of how gated review frameworks operate in capital programmes, see Stage-Gate vs Agile in Infrastructure Programs.
When Does an Independent Project Review Have the Most Impact?
The research is consistent on timing. IPA's data shows that the average project loses 22% of expected net present value at the authorisation decision itself - before construction begins, before major contractor commitments are made, before any execution risk has materialised. The largest single value leak in a capital programme occurs at the approval meeting, not on site.
The implication for timing is direct. An Independent Project Review commissioned before FID is capable of changing the decision basis. A review commissioned after FID can identify problems. It cannot undo the commitments already made or recover the 22% of NPV that was lost at authorisation. The 73-IPR dataset reinforces this: the findings that cannot be corrected after approval are precisely the ones that were fixable before it. For a practical framework on challenging cost and schedule assumptions before they reach an investment decision, see How to Stress-Test Your Project Assumptions When Costs Won't Stay Still.
Where a project is already in execution and the gap between reported status and delivery reality is becoming apparent, independent diagnosis remains the starting point for effective recovery - the calculus simply changes. See 11 Effective Strategies for Project Recovery for what credible project recovery requires once execution is underway.
What Should a Board Expect from an Independent Project Review?
A credible Independent Project Review applies an outside view to estimates and schedules - comparing the project's key parameters against IPA benchmarks and sector base rates rather than accepting the team's own framing as the reference point. It verifies FEL completeness against objective criteria, not whether deliverables exist, but whether they meet the quality standard IPA's research identifies as the threshold for a defensible FID. It provides an independent read of the gap between reported project status and operational reality. And it gives the Board the basis for exercising its governance function at the investment decision: not to override management, but to answer the question that internal reporting cannot reliably answer - is this project ready for the capital being committed to it?
The pattern across 73 Independent Project Reviews, IPA's 20,000-project database, McKinsey's megaproject research, and seven decades of Flyvbjerg's evidence is consistent: the conditions for project failure are established at the front end, they are identifiable before approval, and they are correctable - but only if surfaced by a function that sits outside the delivery chain. Independent project assurance is not a check on management capability. It is the mechanism by which Boards learn what their own reporting is structurally unable to tell them. For the broader set of questions Boards should be asking at every stage of the capital project lifecycle, see What Boards Should Be Asking About Their Capital Projects Right Now.
Is your next FID supported by independent assurance?
PDAS provides independent project governance and assurance for EMR sector organisations, from concept through commissioning. If you want an objective read of your project's readiness before capital is committed, book a discovery call with our team.