Why Do New Hires Fail in the First 90 Days?

New hires fail in the first 90 days because of attitude, not ability — almost nobody gets walked out of a building for lacking a skill you could have taught them. I'm Christian Saab, founder of CPG Recruitment, and since March 2020 my team has built teams across 25+ industries in Canada and the US. Here is the uncomfortable part: when someone washes out on day 60, the decision that failed wasn't made on day 60. It was made in an interview that spent 80% of its time on experience and almost none of it on the things that actually get people fired.

What actually gets someone fired in the first 90 days?

People get fired for attitude, not for gaps in experience. Think about the last person you let go inside their first three months. The exit conversation almost certainly wasn't “they couldn't learn the software.” It was that they didn't take feedback. They were late. They argued with a supervisor. They wouldn't do the part of the job they felt was beneath them. Skills are trainable on a timeline you control. Attitude arrives fully formed on day one, and no onboarding program rewrites it. That is why the first 90 days is really a behaviour test — and most companies keep grading it as a skills test.

Why does an experience-heavy interview miss the real risk?

An experience-heavy interview misses the real risk because it measures the one variable that rarely causes the failure. Count the minutes in your last interview: previous roles, tools used, years in the industry, the resume read back to the candidate. That is the bulk of your most expensive hour spent on information you could have verified in advance with a skills test or a proper reference call. Meanwhile the things that decide whether this person is still here in two years — how they behave when they're wrong, whether they fit the way your team works, whether there is chemistry with the people they'll sit beside — get whatever minutes are left over. I went deeper on that trade-off in should you hire for attitude or experience.

What is the 80/20 interview split?

The 80/20 interview split is simple: 80% of the interview goes to behaviour, culture and chemistry, and 20% goes to experience. That's the formula my team runs at CPG Recruitment, and it is the single biggest reason 87% of our placements are still in the role two years later. It doesn't mean experience stops mattering. It means experience gets screened before the interview — on the resume, in a skills test, through a reference who wasn't hand-picked by the candidate — so the hour itself is spent on the only thing an interview can actually see. Most owners have the ratio exactly backwards, and then wonder why the resume that looked perfect didn't survive the quarter.

What does an 80% behaviour interview actually sound like?

It sounds like a conversation about specific situations the candidate has already lived through, not a quiz about job titles. Pick the handful of things you cannot train — accountability, coachability, how someone handles conflict, and what genuinely motivates them — and spend the hour there. Ask what happened, not what they would hypothetically do; hypotheticals get you the answer the candidate thinks you want to hear. Then push for detail: who else was involved, what they did next, what it cost. A vague answer is information too. And leave silence after the question. The pause is where you find out whether someone reaches for ownership or for an excuse.

How do you test for chemistry before you make the offer?

You test chemistry by putting the candidate in front of the people they'll actually work beside, before the offer goes out — not after. A hiring manager can be charmed in a one-on-one. A team rarely is. The other half of it is agreeing what you're testing for before anyone walks through the door, so every interviewer is scoring the same thing instead of forming a private opinion. When every decision-maker has signed off on the profile in advance, interviews stop being auditions and start being assessments. That discipline is a large part of why we cut average time-to-fill from 68 days to 37 across the industries we serve — fewer interviews, aimed better. Here's how to run a recruitment launch meeting that does it.

What does your side of the first 90 days need to look like?

Your side of the first 90 days has to be as designed as the interview was, or you'll lose good people you correctly hired. A strong candidate who joins and finds no plan, no owner and no feedback draws the obvious conclusion: this place is disorganised, and I've made a mistake. Decide before day one who is responsible for this person, what “good” looks like at 30, 60 and 90 days, and when you're going to sit down and tell them how they're doing. If you only find out at day 85 that it isn't working, you had 84 days of signal and no one was reading it. I broke the early markers down in how do you know if your onboarding is working.

How do you know if your interview process is the problem?

Your interview process is the problem when your turnover clusters in the first 90 days. One early departure is bad luck. A pattern of people leaving or being let go inside a single quarter is a process quietly telling you it's measuring the wrong thing — and the fix is upstream of onboarding, upstream of management, right back in the hour where you decided experience was the question. Pull your last five hires and mark why each one worked or didn't. If the failures are attitude and the interviews were about experience, you've found it. CPG Recruitment has written the company-voice version of this for hiring teams: what causes a new hire to fail in the first 90 days.

Frequently Asked Questions

Can you train a bad attitude out of someone?

No — and trying is the most expensive habit in hiring. You can coach a skill, correct a process and teach a system, because all three live outside the person. Attitude is the person. A manager who believes they'll turn it around usually spends two quarters proving they can't, while the rest of the team watches the standard slip.

Does the 80/20 split work for technical or licensed roles?

Yes, with one change: verify the licence, certification or technical floor before the interview instead of during it. Treat it as a gate, not a topic. Once a candidate has cleared the technical bar on paper or in a test, the interview is free to do the job only it can do — and technical people wash out on attitude at the same rate as everyone else.

How long should a probation period actually be?

Long enough to see the person under normal pressure rather than first-week pressure, which is why 90 days is the common standard. What matters more than the length is having written checkpoints inside it. Probation lengths and notice rules vary by province and state, so confirm yours against local employment standards before you write it into an offer.

Who should be in the room for a behaviour interview?

At least one person who will work with the hire every day, alongside whoever owns the decision. The daily colleague catches things a hiring manager misses, and including them early means you aren't discovering a chemistry problem in week three. Keep the panel small enough that the candidate can actually have a conversation.

If people keep leaving before the quarter is out, the interview is where to look first. CPG Recruitment builds and runs hiring processes for business owners across 25+ industries in Canada and the US — including the behaviour-weighted interview that keeps 87% of our placements in their seat past two years. Get in touch here and we'll pull your process apart honestly.