Improving Board Challenge Processes for Major Capital Decisions
A major capital proposal can arrive in the boardroom looking almost impossible to reject.
The presentation is polished. Revenue forecasts trend upward. The strategic rationale sounds compelling. Management has spent months developing the proposal, and everyone involved seems convinced that the investment will create significant value.
That is exactly when the board needs a strong challenge process.
Major capital decisions – whether they involve a new factory, acquisition, technology platform, infrastructure project, market expansion, or large-scale transformation – can shape corporate performance for years. They are also difficult to reverse once significant money has been committed.
Improving board challenge processes for major capital decisions is not about creating an environment where directors automatically oppose management proposals. The objective is better decision quality.
Boards need processes that expose hidden assumptions, test alternative scenarios, reduce optimism bias, compare investments consistently, and make it easier to say “not yet” when evidence is incomplete.
The best challenge process does not slow good investments down unnecessarily. It helps companies commit capital with greater confidence – and recognize weak investments before they become expensive strategic problems.
Why Major Capital Decisions Need Stronger Board Challenge
Boards already have a clear responsibility around major investments.
The G20/OECD Principles of Corporate Governance identify oversight of major capital expenditures, acquisitions, divestitures, strategy, business plans, and corporate performance among key board responsibilities.
The challenge is that capital decisions rarely arrive as neutral questions.
By the time a proposal reaches the board, a large internal coalition may already support it.
Executives have spent time developing the idea. Consultants may have been hired. Project teams have built financial models. Business-unit leaders may have promised growth targets based on the investment.
Psychologically, the project has momentum.
Directors therefore need to distinguish between challenging management and challenging the investment thesis.
Those are not the same thing.
A director asking whether expected customer demand is realistic is not accusing management of poor judgment. The board is testing an assumption before shareholders’ capital becomes difficult to recover.
That mindset creates healthier conversations.
The purpose of challenge should be to improve the proposal, identify hidden downside, and determine whether the expected return justifies the risks being accepted.
Start With the Investment Thesis, Not the Financial Model
Large investment discussions often begin with numbers.
NPV.
IRR.
Payback period.
Revenue projections.
Capital requirements.
Those metrics matter, but they should not be the first question.
The board should first understand why the investment should create value.
Imagine a company proposing a $750 million manufacturing facility.
The investment thesis might depend on three assumptions:
Customer demand will increase significantly over the next decade.
Regional production will become more attractive than imports.
Automation will allow the new facility to operate at a structural cost advantage.
Those assumptions matter more than whether the spreadsheet currently shows an 18% internal rate of return.
If demand does not materialize, import economics remain favorable, or automation savings disappoint, the calculated return can disappear quickly.
Directors should therefore begin with a simple question:
What must be true for this investment to succeed?
The answer reveals the load-bearing assumptions.
Once those are visible, the financial model becomes much easier to challenge intelligently.
Identify the Few Variables That Can Change the Decision
Major capital models may contain hundreds or thousands of assumptions.
The board cannot challenge all of them.
It should not try.
Instead, directors need to understand the swing factors—the variables capable of materially changing whether the investment creates or destroys value.
McKinsey’s work on large investment decisions recommends identifying these critical characteristics early rather than allowing decision-makers to become overwhelmed by every detail of a complex project.
For a mining project, commodity price and development cost might dominate.
For a data center, electricity availability, utilization, construction cost, and technology demand could matter most.
For an acquisition, customer retention, synergy realization, integration cost, and purchase price may determine the outcome.
For an AI infrastructure investment, computing costs, adoption rates, productivity gains, and technology obsolescence could drive value.
The board discussion should concentrate disproportionately on these variables.
What happens if demand is 20% lower?
What if construction takes eighteen months longer?
What if expected cost savings arrive three years late?
What if a competitor adds capacity simultaneously?
Testing a few decisive assumptions is usually more valuable than debating fifty minor ones.
Bring an Outside View Into the Boardroom
One of the most persistent problems with major investments is optimism bias.
Project teams naturally know their proposal in enormous detail. That knowledge creates confidence.
Unfortunately, knowing more about the project does not necessarily make forecasts objective.
Daniel Kahneman and Dan Lovallo famously argued that executives evaluating major initiatives tend to focus on the specific plan in front of them—the “inside view”—while underweighting what happened in comparable projects elsewhere.
The alternative is the outside view.
Instead of asking only, “Why will our project succeed?” ask:
“How have similar projects actually performed?”
Suppose management expects a large infrastructure project to finish within four years.
The board should see data from comparable projects.
How frequently did those projects finish on schedule?
What was the average cost overrun?
Which assumptions usually failed?
Was this company historically better or worse than the reference group?
McKinsey has noted that using appropriate reference projects can substantially reduce forecasting errors because external evidence counterbalances internally generated optimism.
The objective is not assuming the company will perform exactly like everybody else.
Management may have legitimate reasons to expect better results.
But directors should ask management to prove why this project deserves a more optimistic position within the reference class.
Create Independent Challenge Before Final Approval
The project team should not be the only group evaluating its own proposal.
That sounds obvious, yet internal capital processes frequently make business sponsors responsible for both developing and defending the investment case.
Their incentives naturally favor approval.
An independent challenge function can provide a second perspective.
McKinsey’s 2026 research on large capital projects emphasizes independent cost and schedule validation, noting that even strong project teams can unconsciously produce overly optimistic assumptions.
Independent “cold eyes” reviews can test productivity forecasts, contingency levels, schedules, and expected costs before problems become embedded in execution.
The same philosophy can work at board level.
Independent reviewers might include finance specialists, strategy teams, external technical advisers, industry experts, or executives who are not connected to the project.
Their job is not to kill the proposal.
It is to attack the logic.
What assumption looks weakest?
What risk has been understated?
What alternative investment has not been considered?
What does management need to believe that the external evidence does not support?
The board then receives both the sponsor’s case and an independant perspective.
That creates a much healthier decision environment.
Challenge the Alternative, Not Just the Proposal
Board discussions sometimes create a false choice:
Approve the project or reject it.
Most capital decisions offer more options.
A $2 billion project might be built in phases.
A company could partner instead of owning 100%.
Capacity could be leased.
Market entry might begin through a joint venture.
An acquisition could potentially start with a minority investment or commercial partnership.
Technology could be piloted before enterprise-wide deployment.
This means the board should ask:
What alternatives were considered, and why is this option superior?
A proposal becomes much stronger when management can demonstrate that it evaluated several credible paths.
The relevant comparison is also not always another investment.
Doing nothing has economic consequences too.
A company that rejects an expensive automation program may save capital today while losing competitiveness later.
Similarly, delaying an acquisition can preserve cash but allow another buyer to secure the asset.
Good capital challenge therefore evaluates the full opportunity set rather than trying to find reasons to reject spending.
Use Scenario Analysis Instead of One Beautiful Forecast
A single forecast creates false comfort.
The economy does not know what management placed in the spreadsheet.
Neither do competitors, customers, regulators, technology developers, or financial markets.
Boards should therefore ask for several coherent scenarios around material investments.
EY recommends that boards probe the economic, financial, and customer-demand scenarios management has considered when overseeing capital allocation. It also emphasizes revisiting capital budgets alongside strategic plans instead of treating investment approval as a one-time event.
Suppose management proposes building a new production facility.
The base case looks attractive.
A board challenge could examine at least three environments.
In the first, demand develops according to plan.
In the second, economic weakness reduces utilization for three years.
In the third, a technological shift changes the product mix and requires additional capital.
What does the investment look like in each case?
More importantly, what decisions could management make if one scenario begins unfolding?
A strong project should not necessarily generate great returns in every future.
That would be unrealistic.
But the board should understand where the investment becomes vulnerable and whether management has enough flexibility to respond.
Challenge the Cost of Capital as Seriously as the Project
Capital is not free.
This seems obvious, but changing financing conditions can materially alter an investment that previously looked attractive.
Interest rates, credit spreads, equity valuations, liquidity, and alternative investment opportunities all affect capital economics.
NACD’s September 2026 analysis specifically highlighted how uncertain borrowing costs require boards to pressure-test the assumptions behind major investments and understand debt maturities and refinancing exposure more deeply.
A project producing a modest return can look attractive when money is cheap.
The same project may destroy economic value when the cost of capital rises significantly.
The board should therefore ask whether management is evaluating investments using realistic hurdle rates.
Directors should also examine opportunity cost.
If $1 billion goes into Project A, what cannot be funded?
Could the same money generate better risk-adjusted returns through Project B?
Would debt reduction create more value?
Could share repurchases, organic growth, an acquisition, or a strategic partnership offer a better use of capital?
The correct question is rarely “Is this project profitable?”
It is:
Is this the best available use of scarce corporate capital?
Test Strategic Fit, Not Just Financial Return
A project can have attractive economics and still be strategically questionable.
Imagine an industrial company discovering a highly profitable real estate investment opportunity.
The returns may be excellent.
But does owning commercial property strengthen the company’s strategic position?
Maybe.
Maybe not.
Boards need to test how major capital commitments reinforce corporate strategy.
EY describes capital allocation and corporate strategy as working “hand in glove,” with investment roadmaps expected to support longer-term strategic goals rather than simply short-term financial results.
This matters because capital creates organizational commitment.
Large projects absorb management attention.
They require talent.
They create technology dependencies.
They influence future budgets.
A strategically unrelated project may therefore carry a larger opportunity cost than the spreadsheet shows.
Directors should ask:
Which strategic priority does this investment advance?
Which competitive capability does it strengthen?
How does it improve the company’s future position?
What would be different strategically if we did not make the investment?
If management cannot answer those questions clearly, the board may be evaluating a financial opportunity rather than a corporate strategy decision.
Strengthen Challenge Without Creating an Adversarial Boardroom
Strong challenge does not require hostility.
In fact, an adversarial boardroom can make decision quality worse.
If management expects directors to attack every proposal, teams begin designing presentations primarily to survive the board meeting.
Bad news gets softened.
Uncertainty gets hidden.
Defensive behavior increases.
The better culture separates rigorous questioning from personal criticism.
The board can ask tough questions while signaling that changing the recommendation is acceptable.
For example:
“What new evidence would make you recommend against your own project?”
That question is powerful because it tests whether management remains open to contradictory evidence.
Another useful question is:
“If this investment fails five years from now, what will probably have caused it?”
This invites a pre-mortem rather than an argument.
Effective challenge should make management think more deeply.
It should not train management to become better at hiding uncertainty.
Watch for Executive Sponsorship Bias
Capital proposals often have powerful sponsors.
The CEO may strongly support an acquisition.
A business-unit president may have spent two years developing a factory proposal.
A technology executive may believe a major platform transformation is essential.
Strong sponsorship helps projects move.
It can also make independent challenge difficult.
Junior executives may be reluctant to contradict the CEO.
Finance teams may adjust assumptions toward the range leadership expects.
Project teams can gradually become emotionally invested in receiving approval.
This is where board independence matters.
Directors should create space for dissenting views before the final vote.
One practical technique is asking key functions – finance, risk, strategy, operations, technology, and legal – to provide their assessments separately before the discussion becomes dominated by consensus.
McKinsey has documented companies using independent evaluators to audit models, test assumptions, and gather functional perspectives before investments reach the final committee.
The board does not need artificial disagreement.
It needs confidence that apparent agreement was not created through organizational pressure.
Make Stage Gates Real Decisions
Large projects often use stage gates.
Concept approval.
Feasibility.
Design.
Final investment decision.
Construction.
Commissioning.
In theory, every stage gives the company an opportunity to reconsider.
In practice, stage gates can become ceremonial.
Once enough money and reputation have been invested, stopping feels increasingly difficult.
The board should resist that dynamic.
Each major stage should answer a genuine question:
Has the evidence improved enough to justify the next capital commitment?
New information should matter.
If costs have increased by 40%, management should not automatically receive approval because the project was approved two years earlier.
McKinsey’s research on challenged capital projects recommends independent challenge teams with real influence, including the ability in some organizations to pause or reshape projects during stage-gate reviews.
That discipline protects companies from escalation of commitment.
Money already spent is a sunk cost.
It should not automatically justify spending more.
Make Post-Investment Reviews Part of the Process
Boards spend enormous time deciding whether to approve investments.
They often spend much less time learning afterward.
That wastes valuable information.
A good post-investment review compares the original thesis with reality.
Was the project delivered on budget?
Did demand match expectations?
Were synergies realized?
Did the strategic benefits appear?
Which forecasts were systematically wrong?
Which risks were underestimated?
EY recommends both in-flight reviews for major projects and post-mortems that allow companies to learn from successful and unsuccessful capital decisions.
This should not become a blame exercise.
If managers believe post-investment reviews exist to punish people, they will become reluctant to sponsor ambitious projects.
The goal is organizational learning.
Imagine discovering that five recent investments all underestimated implementation time by 25%.
That insight should change future forecasting.
Maybe the company systematically overestimates customer adoption.
Perhaps integration costs are routinely understated.
Maybe projects involving a specific technology carry higher risk than the capital model assumes.
Every major investment creates information that can improve the next one.
Compare Results With the Original Case
One subtle problem occurs when projects get re-baselined repeatedly.
The initial budget is $500 million.
It becomes $600 million.
Then $700 million.
Management eventually reports that the project was delivered almost exactly on the “updated” $710 million budget.
Technically true.
Strategically misleading.
Boards need visibility into the original investment case.
McKinsey’s 2026 work on capital projects warns against the comforting illusion of projects appearing “on track” because cost and schedule baselines have been revised as difficulties emerge.
The board should always be able to compare:
Original forecast.
Current forecast.
Actual performance.
The same applies to strategic outcomes.
If an acquisition was justified by $200 million in synergies, management should not quietly redefine success two years later around $120 million.
Plans need to evolve, but the original thesis should remain visible.
Otherwise, organizations can become very good at explaining why underperformance was inevitable.
Use Consistent Criteria Across Investments
Politics enters capital allocation when different projects are evaluated using different standards.
One division uses aggressive revenue assumptions.
Another is required to submit conservative forecasts.
One project receives credit for strategic benefits.
Another must justify everything through near-term cash flow.
Consistency matters.
McKinsey’s work on challenged projects recommends standard criteria that allow leadership to evaluate investments on their economic and strategic merits rather than allowing every sponsor to create a unique definition of success.
That does not mean every investment uses identical metrics.
A new factory and an early-stage AI experiment obviously have different profiles.
But the governance philosophy should remain consistent.
What value is being created?
What risks are being accepted?
How much capital is exposed?
What evidence supports the assumptions?
How reversible is the investment?
What milestones determine future funding?
Consistency makes portfolio comparisons easier.
It also reduces the ability of powerful sponsors to win approval simply by presenting their projects more persuasively.
Challenge Portfolio Balance, Not Just Individual Projects
Even strong projects can create a weak portfolio.
Imagine a company approving five investments independently.
Each one is attractive.
But all five depend on strong Chinese demand.
Or low energy prices.
Or one technology standard.
Or continued access to cheap financing.
The portfolio may contain far more concentration risk than any individual project reveals.
Boards should therefore zoom out.
What assumptions are shared across major investments?
Where is capital concentrated?
How much of the portfolio depends on one geographic market?
How many initiatives require the same scarce technical talent?
What happens if several projects need additional capital simultaneously?
This is especially important because investors increasingly care about capital-allocation discipline.
McKinsey’s 2026 investor survey found that 63% of respondents viewed ROIC discipline as a hallmark of a high-quality capital allocator, while 54% looked for a clear capital-allocation framework.
Board challenge should therefore operate at two levels.
Is this investment good?
And does it make the overall portfolio better?
Those are not necessarily the same question.
Know When to Say “Not Yet”
Boards sometimes feel forced toward binary decisions.
Approve or reject.
There is a valuable third answer:
Not yet.
The strategic idea may be attractive while evidence remains insufficient.
Technology may need further validation.
Regulatory uncertainty could be too high.
Construction estimates may still be unreliable.
Customer demand may require additional testing.
A “not yet” decision can preserve strategic optionality without exposing the company to the full downside.
Management might be authorized to spend another $10 million proving specific assumptions before returning for a $500 million commitment.
This approach is particularly useful for uncertain innovation investments.
EY recommends appropriate guardrails around innovation “moon shots” and stresses the value of measuring progress and being willing to fail fast rather than allowing hype to override capital discipline.
A good board does not merely know how to approve or reject projects.
It knows how to structure the next decision so uncertainty can be reduced before more capital is committed.
Review the Board’s Own Challenge Quality
Management is not the only party that should be evaluated.
Boards should examine whether their challenge process works.
Do directors receive materials early enough?
Are alternatives presented?
Does the board hear independent perspectives?
Are assumptions clearly identified?
Do discussions happen before management becomes fully committed?
Are directors comfortable disagreeing?
Does the board spend enough time on decisions relative to routine reporting?
Does it revisit investments after approval?
A sophisticated investment process can still fail if directors engage too late.
If the first serious board discussion happens when a deadline requires approval tomorrow, challenge becomes largely symbolic.
Likewise, directors need appropriate expertise.
A board evaluating a multi-billion-dollar AI infrastructure strategy may need external technical input if nobody around the table understands the economics well enough to challenge management.
Good goverance includes recognizing the limits of the board’s own knowledge.
Asking for expert help is not a weakness.
Approving a major investment without understanding the critical assumptons is.
Improving board challenge processes for major capital decisions is not about making boards more skeptical of management.
It is about making corporate investment decisions more resistant to optimism, internal politics, incomplete information, and irreversible mistakes.
Strong boards start with the investment thesis, identify swing factors, use external reference cases, demand independent challenge, test multiple scenarios, and compare projects against real alternatives. They also create meaningful stage gates and review results after capital has been committed.
Most importantly, directors should challenge the logic before becoming emotionally or financially committed to the answer.
For your next major investment proposal, ask one question before opening the spreadsheet: What would have to be true for us to regret approving this decision five years from now?
Then make sure the board seriously tests those conditions before voting.