What separates a great EA from an average one.

If you’ve ever managed a great EA, you’ll know the feeling of not quite being able to explain what makes them great. It isn’t speed, plenty of EAs are fast. It isn’t polish, most senior EAs write cleanly. It isn’t organisation, that’s the table stakes. It’s something quieter: a pattern of small judgement calls, each one barely noticeable on its own, which add up over a year to a role you don’t have to think about. The inbox gets cleaner. The calendar gets sharper. The people around the principal start to work better. You don’t know exactly what changed, you just feel the friction disappearing.

That pattern is hard to write on a job ad, and it’s what most interview processes fail to measure. When we built The Core Standard, we spent nearly a year isolating what the pattern actually is. What we landed on is five pillars. Not skills, dispositions. Every EA we’ve ever seen perform at the top of the market shows all five, reliably, under pressure. Every EA we’ve seen struggle is missing at least one.

We score every candidate against these five pillars in the executive assistant assessment that employers commission. If you are running a search right now, our guide to hiring an Executive Assistant shows where the pillars fit in the wider process. Here they are in full, what they mean, what great looks like, and where average quietly leaks through.

“Great EAs don’t just do more, faster. They operate on a different set of instincts.”

Pillar 1, Prioritisation

What it measures: The ability to triage competing demands under time pressure, and to decide what comes next without asking.

A day in the life of any senior EA is a series of forks. An email arrives from the chair while the candidate is mid-way through a travel booking and the principal is asking for a pre-read. Everything is “urgent”, and almost none of it can be deferred. The difference between a great EA and an average one, in that moment, is not in speed, both will move fast, but in which thing they do first, and why.

Prioritisation isn’t about following a framework. It’s about having a framework. Great EAs can articulate, instantly, the principle by which they’re sequencing the next three tasks: who is blocked, what’s irreversible if delayed, what requires the principal’s input vs. what can be closed autonomously. Average EAs optimise for what feels loudest. That usually means the last email that arrived, or the one from the person with the scariest title.

In a scenario-based executive assistant test, you can spot this within ten minutes. Ask the candidate to lay out their sequence and explain the reasoning. A great EA has reasons. An average one has vibes. If all you have is an interview room, these are the questions that get at prioritisation.

Pillar 2, Judgement

What it measures: The ability to spot what matters, catch what others miss, and read between the lines of what’s been said.

Judgement is the pillar that’s hardest to fake and hardest to teach. It’s the pattern-recognition an EA develops after a few years of watching what their principal actually cares about and, crucially, what the principal hasn’t said but is about to ask. When a brief arrives that’s missing a critical piece of information, a discerning EA notices. When a meeting agenda has the wrong attendees, they push back. When an email reads calmly but the subject line is slightly off, they know something is wrong.

Average EAs execute the brief as given. Great EAs execute the brief as meant. The gap between those two things is where most of the value of a senior EA actually sits, and it’s the pillar most likely to separate a £60k EA from a £90k EA, all else equal.

In a scenario, you test Judgement by planting ambiguity. A brief with a small inconsistency. A calendar with an unresolved conflict. An email that subtly contradicts something said the day before. The astute candidate will surface the issue unprompted. The average candidate will proceed as if everything is fine.

Pillar 3, Communication

What it measures: The ability to draft, respond, and adapt tone across audiences, under pressure.

Communication is where most EA job ads start and most EA assessments end. Can they write a clean email? Can they take a note? The pillar goes deeper than that. What we’re measuring is tonal range: can this EA write to a board chair and a supplier in the same afternoon and sound appropriate to both? Can they draft a declining email for the principal that closes the door firmly without damaging the relationship? Can they respond to a testy internal message in a way that defuses it, not inflames it?

Average EAs have one voice. It’s usually polite, usually careful, and usually the principal’s voice filtered through them. Great EAs have a dial. They can shift from warm to crisp to forensic inside a morning, matching the register of the audience while keeping the principal’s intent intact. That range is what lets them operate on the principal’s behalf, not just on their direction.

In a scenario, Communication is the pillar easiest to assess because the output is on the page. You can read it. The question isn’t “is the email well-written?”, it’s “did this candidate choose the right register for the moment?” Rubrics that only measure grammar miss what actually matters.

Pillar 4, Execution

What it measures: The ability to turn a brief into a deliverable. Planning, accuracy, and follow-through.

Execution is the pillar that looks the simplest and is the hardest to do consistently. Most EAs can execute when the brief is clear, the path is linear, and the deadline is kind. The test is whether they can execute when none of those three things are true, which is, in any senior EA role, most weeks of the year.

A great EA takes an ambiguous brief (“sort out the Q3 offsite”) and converts it, within the hour, into a draft plan with a first decision needed from the principal, a list of assumptions they’re making, and a clean timeline. An average EA waits for clarification, or worse, executes the most obvious interpretation of the brief and returns a product that technically matches the words and entirely misses the intent.

The difference is small at the start of the task and enormous at the end. A great EA’s deliverables arrive anticipating the next three things the principal will ask for. An average EA’s deliverables arrive complete but reactive, every follow-up triggers another round trip.

In a scenario, Execution is where reviewers see the widest spread. You can separate a top-decile EA from a competent one within a single multi-step task, just by looking at what they proactively included that wasn’t literally asked for.

Pillar 5, Partnership

What it measures: The ability to operate as a genuine partner to the principal, not just a task-doer. Anticipation, stakeholder management, and the trust to act on their behalf.

Partnership is the pillar that turns a capable assistant into an indispensable one. It is the difference between an EA who waits to be told and one who already has the answer ready. A great EA holds the principal’s world in their head: who is waiting on what, which relationship is fraying, what the principal will need on Thursday that nobody has asked for yet. They manage stakeholders in the principal’s name without being asked, protect their time and their reputation, and earn the latitude to make calls on their behalf.

Average EAs support the principal. Great EAs extend them. They act as a second brain and a trusted proxy, so the principal can hand over not just tasks but judgement, knowing it will be exercised the way they would exercise it themselves. That trust is not given on day one. It is earned by an EA who consistently reads the situation right and acts before the gap becomes a problem.

In a scenario, Partnership shows up in what the candidate does with the space between the lines. Do they flag the stakeholder who has gone quiet? Do they protect the principal from the meeting that should never have reached the diary? Do they anticipate the follow-up, or wait to be asked? The candidate who partners is already three moves ahead.

What the pillars add up to

The five pillars aren’t independent. They compound. An EA who has three of the five can still be a good hire for a narrow brief. An EA who has all five is the one you promote, protect, and pay well above market to keep. When we score a candidate against the pillars, we’re not looking for a perfect score, we’re looking for the shape of their strengths. A candidate who is 85th-percentile on Judgement and 55th on Prioritisation is a very different hire from one who is 85th on Prioritisation and 55th on Judgement. Both can excel, but in different roles.

This is also why the pillars are the same across every level of EA we assess. The behavioural markers change, an Operational EA and a Strategic Business Partner both need Prioritisation, but the complexity of the calls they’re making is different by an order of magnitude. The rubric scales with seniority. The five pillars don’t. (The same pillars also translate into our EA Manager Edition for anyone running a team of EAs, where the pillars are tested in a multi-EA team context.)

For the EAs reading this

If you’re an EA yourself, you may be reading the pillars and mapping them onto your own practice. Most senior EAs we know can identify the pillar they lead with and the one they’ve had to deliberately develop. That self-awareness is, in our experience, the single strongest predictor of an EA continuing to grow into more senior remits.

If you want to sit the assessment yourself and see your own scores across the five pillars, TCS Certified is the candidate version. You receive the same expert-reviewed report, your Recruiter Summary, and your certificate for £175 inc. VAT, and can share your TCS rating with any recruiter or employer. Many senior EAs we know take it every eighteen months as a form of calibration. It is the clearest signal to a potential employer that you are serious about operating at the top of the craft.

Want to see exactly how the scoring works, end to end? Here is how the Core Standard assessment runs, from commission to report.

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The Core Standard is a scenario-based assessment for Executive Assistants, Private PAs, and Chief of Staff hires. Every candidate is scored against the five pillars above, reviewed by an expert, and rated on a 0 to 100 benchmark. Employer pricing from £495 +VAT. TCS Certified for candidates £175 inc. VAT.