A friend I respect a great deal told me recently that psychometric tools, all of them, HBDI, DISC, the lot, are basically astrology with a research budget. Interesting people read horoscopes for entertainment and then take a leadership colour code dead seriously in the same week. He said it with real conviction, and I still think about it, because I don’t fully agree with him, and I love him for saying it anyway.

Here’s the part where he’s got a point. A lot of these tools have real reliability problems. Someone takes the same instrument twice, six months apart, nothing much has changed in their actual life, and they come out with a different result. Some of the assessments used most widely in corporate leadership programs have thinner evidence behind them than most people assume, especially the ones built more for workshop energy than for peer-reviewed rigour. If you’re expecting the kind of predictive accuracy you’d get from a blood test, you’re going to be disappointed, and you should be.

Where I part ways with him is on what that actually means. Because whether a test can predict your future with certainty isn’t the same question as whether it’s useful. Those are two different claims, and conflating them is where a lot of the criticism, fair as parts of it are, starts to overreach.

What a decent psychometric tool actually does, in my experience, is give a group of people a shared vocabulary for something they were already circling without being able to name. Put a leadership team through a behavioural profile and half the value isn’t the report itself. It’s that two people who’ve worked together for six years suddenly have a socially acceptable way to say “I think that’s why we clash in every planning meeting” without it turning into a personal attack. The framework becomes a bit of neutral ground. Nobody’s defensive about being a colour or a letter the way they’d be defensive about a direct accusation.

The trouble starts when people forget that’s what it’s for. A tool meant to open a conversation gets used to close one down instead. Someone gets filed away as a type, and suddenly that’s the whole explanation for every future disagreement, instead of one lens among several. That’s not really the psychometric’s fault. That’s what happens when a useful provocation gets mistaken for a verdict.

So where does that leave the astrology comparison? Probably closer to the truth than most of the industry would like to admit, and further from it than my friend thinks. Astrology doesn’t hold up as prediction, and neither does a psychometric profile, not in the way people privately hope it will when they’re handed a report with their name on it. But a good horoscope and a good psychometric debrief can both do the same modest, useful thing: give someone a starting point for a conversation about themselves they weren’t quite having before. The difference is what you do with it afterwards. Treat it as gospel, and you’ve bought into something with far less evidence behind it than the seriousness suggests. Treat it as a way in, and it’s earned its place in the room.

I still don’t agree with my friend. But I understand exactly why he says it, and most people who take these tools far too seriously would do well to sit with his version of the argument for a while before they trust the report over the room.