Assessing the leaders answers half the question; the other half is whether the arrangement around them supports what the plan demands.
Why it matters when the plan changes
A deal team can assess five executives thoroughly and still miss the reason the plan will slow, because the constraint sits in an interface rather than in a person. Due diligence is conventionally scoped to the parties and the assets of a transaction, which is exactly where individual assessment stops and organisational reality begins. Strong individuals in an arrangement that does not support the new plan produce exactly the pattern that later reads as a management failure and was not one.
The tension is that individual assessment is the part that is tractable. There are established methods for assessing a person and almost none for assessing whether a specific organisation can carry a specific plan. Cross-unit commitments are already known to be unreliable, with only nine per cent of managers saying they can rely on colleagues in other functions and units all the time, yet that exact seam is rarely examined before commitment. Work goes where the method exists, which is not always where the risk is.
In practice
Diligence on a buy-and-build rates the chief executive and the finance director highly and both ratings hold up afterwards. The plan stalls on integration, where the decision about which systems survive belongs to nobody: the parent used to make it, and the new structure never reassigned it. No assessment of any individual would have found that.
Evidence
Due diligence is the investigation a reasonable party is expected to undertake before entering an agreement, and it is conventionally scoped to the parties and the assets.
Due diligence, Wikipedia (2026)Commitments that run between units are reported as far less reliable than those inside a line, which is where an assessment of individuals cannot reach.
Donald Sull, Rebecca Homkes and Charles Sull, Why Strategy Execution Unravels and What to Do About It, Harvard Business Review (2015)
What it cannot tell you
Management due diligence tests the people, not the arrangement they operate within. It cannot show whether decision rights, dependencies or sequencing across the organisation will support the plan. A team can pass every individual assessment and still fail on a constraint that sits between roles rather than inside any one of them.
Questions
Track record, capability, credibility and motivation of the leadership team, tested against the investment case through interviews, references and sometimes assessment. Due diligence itself is defined, per Wikipedia (2026), as the investigation a reasonable party is expected to undertake before entering an agreement, conventionally scoped to the parties and the assets.
Constraints that sit between people rather than within them: decisions nobody owns, dependencies the plan relies on, sequencing the structure cannot support. Harvard Business Review (2015) research found only nine per cent of managers say they can rely on colleagues in other functions and units all the time, a gap no individual assessment reaches.
Yes. It answers a real question and answers it with established methods. The argument is not that it should be replaced, but that it is half the question, and the other half currently has no owner in a typical diligence process.
Early enough that the answer can still change the decision or the price. Late-stage assessment tends to confirm a view already formed, which is a use of the process rather than a test of it, and access usually improves at exactly the point when the finding can no longer matter.
What the plan demands, where the evidence supports the team carrying it, where it does not, and what remains unseen. A rating without stated evidence, confidence and counter-evidence is an opinion, and an opinion is what the process was meant to replace.