Think about the last senior hire your organisation made that did not work out. Not the obvious misfire, the one everyone saw coming. The harder one. The candidate who interviewed brilliantly. Who came with a strong track record. Who said all the right things in the room and had the references to back it up. The one you genuinely believed in. And then, somewhere between the offer letter and the twelve-month mark, it became clear that something was fundamentally wrong.
The gap between track record and fit
The assumption most hiring processes are built on is that past performance predicts future performance. In some contexts, for some roles, this holds. A salesperson who has consistently hit quota across three organisations is likely to hit quota in a fourth.
But at the senior leadership level, the variables that determine success are far more complex than output history. How a leader performed in a previous culture does not tell you how they will perform in yours. How they led a team through a period of stability does not tell you how they will lead through transformation. How they managed up in their last role does not tell you how they will manage across in yours.
The competencies that determine senior leadership effectiveness are behavioural and emotional before they are technical. They live in how a person is wired: how they communicate under pressure, how they process conflict, how they build trust, how they respond when things are uncertain and the path forward is not obvious. None of this shows up reliably in a CV. Very little of it surfaces in even a well-run interview process.
Organisations making senior hiring decisions are typically working with the least reliable data available to them, and treating it as sufficient.
What a wrong hire actually costs
The figure most commonly cited is that a mis-hire at the senior level costs between three and five times the annual salary of the role. Some research puts it higher for executive appointments when you factor in the full impact: the productivity gap during transition, the cost of the search process, the severance, the time the leader’s manager spent managing the situation rather than the business, and the downstream effects on the team.
When a senior leader does not work out, they rarely exit cleanly. They leave behind a team that has been shaped by their leadership, sometimes damaged by it. They leave behind relationships that were strained or broken. They leave behind a vacancy at a critical point, when the organisation now has to restart a process it already ran once, often with less confidence and more urgency than before.
And the organisation rarely asks the most important question in the aftermath: not why did this person fail, but why did we not see this coming? Because in most cases, the signals were there. They simply were not being measured by the right instruments.
The data that changes the decision
Behavioural and competency diagnostics used in the selection process do not replace judgment. They inform it. They take the intuition that an experienced hiring manager or HR leader brings to a decision and give it something objective to work against: a validated, structured picture of how a candidate is behaviourally wired, how their natural style aligns with the specific demands of the role, where their natural strengths will accelerate their contribution, and where their behavioural risk areas will need active management from day one.
First, it removes the halo effect. Candidates who are compelling in person can mask behavioural patterns that will surface under pressure once they are in the role. A diagnostic assessment gives you data that is independent of how well someone performs in an interview environment.
Second, it makes onboarding proactive rather than reactive. Even for candidates who are genuinely right for the role, every leader has areas of behavioural risk. A diagnostic profile surfaces those areas before the hire is made, giving the organisation and the leader’s manager a roadmap for the conversations, the support structures, and the expectations that will set the hire up to succeed.
Third, it gives organisations a defensible basis for their decisions. In a world where hiring decisions at the senior level carry significant legal, reputational, and commercial consequences, being able to demonstrate that a structured, validated, objective process was followed is not just good governance. It is organisational protection.
The cost of a comprehensive selection diagnostic is a fraction of one month's salary. The cost of getting the hire wrong starts at three times the annual salary and climbs from there.
The decision you make before the decision
Every senior hire is preceded by a series of smaller decisions about how the decision will be made. Whether to use structured or unstructured interviews. How many reference checks to conduct and what to ask in them. Whether to engage a search firm or hire directly. And the one that most organisations still treat as optional: whether to use validated behavioural and competency data as part of the process.
That last decision determines the quality of all the others. Because the best interview process, the most thorough reference check, and the most experienced hiring panel will still produce the wrong result at a predictable rate if the behavioural and competency data is missing from the picture.
The most expensive decision your organisation makes without data is not the decision to enter a new market, acquire a competitor, or launch a product. It is the decision to put a leader into a role that will shape your culture, your people, your performance, and your reputation, without knowing how they are actually wired to lead.
