Compatibility is not a list of shared interests

You like the same old Hindi songs. You both want to travel, both eat the same food, both say you want two children. On paper, it looks like a match. Then the auto driver refuses the fare, the plan falls apart, and the next two days are very quiet.

Why does a long list of things in common not protect you from that?

What the list leaves out

A list of shared interests tells you what two people like. It does not tell you what they do when something goes wrong.

One large piece of research looked at this. Researchers led by the psychologist Samantha Joel pooled data from 43 earlier studies of couples, about eleven thousand couples in all, who were already together. Using a computer method to sort which answers predicted how happy people were with the relationship, they found that the personality of each person and the match between the two of them predicted little. The things that tracked more strongly with a good relationship were how the two people felt about the relationship itself: how committed they felt, how appreciated they felt, how satisfied they felt, and how much conflict there was.

Read this with care. It was based on what people reported about themselves, and it was about couples already together, so it describes what goes along with a good relationship. It does not tell you who to choose, and it does not say that shared interests are worthless. They are pleasant. They just do not carry much weight on their own.

There is also a long line of observational work on married couples by the psychologist John Gottman. His group reported that most disagreements between couples were about problems that never fully go away, and that the happier couples were the ones who could talk about those problems with some warmth. That is his own reading of his own data, and not every researcher agrees on the numbers. It is a useful idea, and not a settled fact.

Put together, the direction is plausible and not proven: how two people handle a disagreement may tell you more than what they both like.

Why we reach for the list

The list is comfortable. It feels like evidence, and it is easy to compare. "He likes cricket, I like cricket" is a fact you can hold in your hand. How the two of you behave when you are both tired and hungry and the plan has changed is harder to see, and it is not on any profile.

There is a second reason. When we are first getting to know someone, we tend to notice the likeness and enjoy it. It makes the other person feel safe and familiar. That is a good feeling, and nothing is wrong with it. It just should not be asked to do a job it was not built for.

What this means early on

In the first months, you are collecting information. The list of shared interests is the easy part, because it comes up on its own. How someone handles a small problem only shows up when there is a small problem.

Small problems are everywhere. A late arrival. A restaurant that is full. A change of plan because of a call from home. These are not tests to pass or fail. They are the only place the other half of compatibility becomes visible.

The one to try this week

The next time a small plan goes wrong on a date, the rickshaw does not come, the film is sold out, or one of you is thirty minutes late, watch for ten minutes. Do not judge anyone. Just notice three things. Does each of you stay curious, or does it turn into blame? Does each of you say what you want, plainly? Does it get lighter again?

Later that evening, say this: "That plan was a mess. How was it for you?" Then listen, and say nothing for ten seconds before you answer.

The first time may feel strange, as if you are reviewing the date. That feeling passes. You are not scoring the other person. You are noticing how the two of you are together when the plan breaks, which is a thing no list can tell you.

If you are not on a date at the moment, you can use the same idea with anyone you are close to. The next time your family plan changes, a guest cancels or the lift is out of order, watch how the two of you move through it.

One try is a small sample. Look for a pattern over a few weeks, and do not decide anything from a single evening.

Each Sunday: one question to ask your partner, the research behind it, and one thing to try. The free Relationship Checkup is open to everyone, any time.