Your Best People Are Thinking About Leaving — Here's How to Spot Them
Most managers find out someone's leaving when the resignation letter hits their inbox. By then? It's already over. The decision was made weeks — sometimes months — ago. Everything after that is just paperwork.
The real question isn't "how do we replace this person." It's "why didn't we see this coming?"
Attrition isn't a surprise. It's a pattern.
When people talk about attrition, they usually mean the slow bleed: employees leaving, not getting replaced, institutional knowledge walking out the door. And sure, some turnover is normal. People move cities, change careers, retire. That's life.
But the expensive kind — the kind where your top performer leaves for a competitor because nobody bothered to ask how they were doing — that's preventable. At least, a lot of it is.
The "Great Resignation" made this painfully obvious. Companies that were paying attention to their people data saw it building. Companies that weren't got blindsided.
What actually pushes people out
It's rarely one thing. It's a pile-up.
Work-life balance gets mentioned a lot, and yeah, it matters. But it's more specific than that. It's the manager who schedules 4pm Friday meetings every week. It's the "quick question" Slack messages at 9pm. It's the unspoken expectation that you'll always be available, even though nobody would ever say that out loud.
Company culture is the other big one — and it's harder to pin down. When people say "the culture is off," they usually mean something concrete: their ideas get ignored in meetings, promotions feel political, or there's a gap between what leadership says and what actually happens day-to-day.
Then there's growth. Or the lack of it. If someone's been in the same role for two years with no clear path forward, they're going to start looking. Not because they're disloyal. Because they're ambitious. And that's exactly the kind of person you don't want to lose.
Onboarding matters too — more than most companies realize. A rough first 90 days can poison the whole tenure. If a new hire feels lost, unsupported, or like they made a mistake accepting the offer, you're already on the clock.
The warning signs — if you know where to look
People don't usually announce they're unhappy. But the signals are there.
Productivity dips. Not dramatically — just a slow fade. The person who used to volunteer for projects stops raising their hand. Meeting participation drops. They're still doing their job, but the discretionary effort is gone.
Absenteeism ticks up. More sick days, more "appointments." Sometimes they're interviewing. Sometimes they're just burned out. Either way, it's a signal.
And here's the one that's easy to miss: disengagement from the team. They stop joining optional social stuff. They're less responsive in group chats. They eat lunch alone more often. None of these mean someone is definitely leaving — but the pattern matters.
The problem with gut feeling
Some managers are great at reading people. Most aren't — or they're too busy to notice the subtle shifts. And even the best managers have blind spots. They might assume their star employee is happy because they never complain. (Hint: the ones who never complain are often the ones most likely to leave quietly.)
That's where data helps. Not as a crystal ball — nobody can predict individual resignations with certainty. But patterns across teams, tenure, compensation, manager changes, workload — these things tell a story. And it's usually a story that was obvious in hindsight.
What Cast's Attrition Indicator actually does
Cast's Attrition Indicator pulls together multiple signals — things like time since last promotion, manager tenure, team size changes, compensation relative to market, and engagement patterns — and flags employees by risk level.
Green means low risk. Orange means something's shifted — worth a check-in. Red means you should probably have a conversation this week, not next quarter. Gray just means there's not enough data yet.
It's not magic. It doesn't read minds. But it does something most managers can't do on their own: track a dozen variables across their entire team simultaneously and surface the ones that matter right now.
So what do you actually do with it?
The indicator is only useful if it changes behavior. Here's what that looks like in practice:
Have real one-on-ones. Not status updates. Actual conversations about how someone's feeling about their role, their growth, their workload. If Cast flags someone as orange, that's your cue. Don't wait for the annual review.
Look at the team view, not just individuals. If an entire team is trending toward higher risk, the problem probably isn't the individuals — it's the environment. Maybe the manager is struggling. Maybe the workload is unsustainable. The team-level view tells you where to dig.
Don't panic on red. A red flag doesn't mean someone has an offer letter in their pocket. It means the conditions are there for them to start looking. That's actually good news — because it means you still have time.
And sometimes? The data will tell you something you don't want to hear. That your best performer is underpaid. That a popular manager is actually driving people away. That's uncomfortable. But it's better to know.
The cost of doing nothing
Replacing an employee costs somewhere between 50% and 200% of their annual salary, depending on the role. For senior positions, it's higher. And that doesn't account for the knowledge loss, the disruption to the team, or the months it takes a replacement to get up to speed.
Most of that cost is invisible until you add it up. Which is why so many companies treat attrition as a cost of doing business rather than something they can actively reduce.
Cast is an HR analytics platform that helps managers spot these risks early — before the resignation letter, before the exit interview, before the Glassdoor review. Built for mid-size companies that want real insights without a six-month implementation.
You don't need perfect data to make better decisions. You just need to start paying attention earlier than you are now.