Strategic misrepresentation of cost estimates at identification stage
Cost estimates are strategically understated or overstated during project identification to secure approval, with expectations of recovering profits later through variations, claims, or renegotiations.
Red Flags & Indicators
- Cost, benefit, and schedule estimates lack clear data sources, assumptions, or sensitivity tests.
- Forecasts and schedules are overly optimistic, with limited benchmarking.
- Operation and maintenance costs are not adequately taken into consideration.
- Baseline estimates are revised repeatedly and managed informally, without explanation or an audit trail.
- Terms of reference narrow the analysis or exclude credible alternatives.
- Independent technical review is missing, rushed, or limited.
- Large gaps appear between internal and external estimates without reconciliation.
Stakeholder Guidance
Stakeholder Exposure
Exposure includes relying on unrealistic baseline assumptions, which can lead to later disputes and raise both compliance; and reputational risks.
Decision Point
Before early engagement and bid/no‑bid decision, ensure that project assumptions and estimates are transparent and defensible. Proceed only if they are evidence-based and benchmarked.
Mitigation Actions
• Refuse pressure to tailor evidence to a predetermined option
• Maintain calculation files and benchmarking/reference-class checks with assumptions and data‑sources
• Present estimates as a range with stated confidence (e.g., P50/P80) and a clear contingency rationale
• Request internal sign-off for optimism-sensitive assumptions and any departures from estimating standards
• Request or commission independent peer review for key parameters (demand, costs, benefits) when estimates deviate from benchmarking
• Use internal compliance escalation processes and whistleblower channels, where available, to flag concerns and avoid certifying unreliable estimates
Mitigation Resources
Evaluate the assumptions, quantities, costs, benefits, and scenarios underpinning the cost estimate package; benchmark and challenge estimates where unsupported assumptions, weak data, or departures from standard estimating methods make the estimate unreliable.
Appraisal and cost-estimate assurance — https://toolbox.infrastructuretransparency.org/resource/appraisal-and-cost-estimate-assurance/Identify fraud risks in the cost estimate package; define preventive and detective controls, assign internal responsibilities, and track incidents, escalations, and corrective actions relating to unreliable or manipulated estimates.
Fraud risk assessment and response — https://toolbox.infrastructuretransparency.org/resource/fraud-risk-assessment-and-response/Failure Cases
Good Practices
Stakeholder Exposure
Exposure includes mispriced risk; non‑viable projects; and renegotiation or fiscal stress that can impair returns, increased refinancing or exit pressure.
Decision Point
Before early spend, signing a memorandum of understanding or a term sheet, require independent verification of estimates and downside scenarios. Proceed only if the estimate is evidence-based and independently reviewed; otherwise pause/exit.
Mitigation Actions
• Treat unmanaged optimism bias, unclear scope, or missing contingencies as a stop/go condition
• Include condition engagement on an evidence pack: traceable cost build-up, benchmarking/reference-class evidence, and sensitivity/downside tests, and document any deviations and who approved them
• Include staged financing provisions linked to disclosure milestones related to business case and appraisal documents
• Include term-sheet protections for material changes pre–financial close: disclosure obligations, re-appraisal/re-baselining triggers, and investor pricing adjustment
• Include termination rights if material assumptions change without transparent justification
Mitigation Resources
Evaluate the assumptions, quantities, costs, benefits, and scenarios underpinning the cost estimate package; benchmark and challenge estimates where weak analysis, unmanaged optimism bias, missing contingencies, or unsupported assumptions make the estimate unreliable.
Appraisal and cost-estimate assurance — https://toolbox.infrastructuretransparency.org/resource/appraisal-and-cost-estimate-assurance/Review publicly disclosed cost estimate records before early engagement or approval decisions; identify omitted assumptions, missing cost build-up, or unexplained revisions early.
Transparency and data disclosure standards — https://toolbox.infrastructuretransparency.org/resource/transparency-and-data-disclosure-standards/Failure Cases
Good Practices
Stakeholder Exposure
Exposure includes projects approved on unrealistic budgets; time and cost overruns; increased renegotiation pressure; higher audit risk; and loss of credibility.
Decision Point
Before approving a project concept or business case, require independent appraisal, a budget envelope and publish appraisal documents. Approve only when the estimate is traceable, stress-tested, and properly documented.
Mitigation Actions
• Commission independent technical and economic review for major and high profile projects
• Publish key assumptions and appraisal documentation as a transparency rule
• Maintain an audit trail for appraisal review process and project cost revisions (who/what/why/when)
• Apply data quality protocols and require reconciliation/rework when scope traceability, contingency rationale, or stress-testing is missing
Mitigation Resources
Evaluate the assumptions, quantities, costs, benefits, and scenarios underpinning the early-stage cost estimate and business case; benchmark and challenge cases where weak analysis, unsupported assumptions, or missing stress-testing make the estimate unreliable.
Appraisal and cost-estimate assurance — https://toolbox.infrastructuretransparency.org/resource/appraisal-and-cost-estimate-assurance/Apply stage-gate reviews, readiness checks, and documented approval logs before approving the early-stage business case; return the case for further appraisal where cost estimates, supporting analysis, or value-for-money are not adequately evidenced.
Stage-gate governance and independent assurance — https://toolbox.infrastructuretransparency.org/resource/stage-gate-governance-and-independent-assurance/Failure Cases
Good Practices
Stakeholder Exposure
Exposure includes delayed delivery; higher public debt; and reduced trust when early estimates are not credible and the public is misled on true costs/benefits.
Decision Point
During budget cycle allocation and/or pipeline publication, submit access to information to request supporting evidence on project assumptions and appraisal documentation. Decide whether to challenge the early estimate (cost assumptions and cost breakdown) or hold and monitor, escalating through formal oversight channels when evidence is missing or the estimate shifts without explanation. During project implementation, submit access to information to clarify major cost revisions.
Mitigation Actions
• Track project implementation to identify revisions, claims or renegotiations of major estimates, and use access to information to request disclosure of corresponding claims documentation
• Advocate for disclosure of project information based on recognised infrastructure data standards such as the OC4IDS
• Engage oversight bodies when cost estimates and cost revisions appear systematically inconsistent, biased and overly optimistic (use safe, confidential reporting and anonymisation where retaliation risk is material)
• Mobilise communities affected by inadequate project delivery to raise concerns about poor project planning
Mitigation Resources
Request access to non-public cost estimate records, such as assumption notes, revised estimates, reference-class checks, or records explaining changes in cost assumptions, so omitted assumptions, unexplained revisions, or weak justifications can be examined and raised through oversight channels.
Access-to-information and demand-side transparency — https://toolbox.infrastructuretransparency.org/resource/access-to-information-and-demand-side-transparency/Review publicly disclosed cost estimate and appraisal records at an early stage; identify missing assumptions, omitted revisions, or unexplained changes, and raise concerns about non-disclosure with an oversight body.
Transparency and data disclosure standards — https://toolbox.infrastructuretransparency.org/resource/transparency-and-data-disclosure-standards/