Commitment, and what it actually consists of

Commitment is treated as a single quality that someone either has or lacks. The models used in relationship research break it into parts, and the parts predict different things.

The three components

The most widely used framework proposes that commitment is a function of three factors.

Satisfaction — how rewarding the relationship is relative to expectations.

Quality of alternatives — how good the available options outside the relationship appear, including the option of being alone.

Investment size — what has been put in that would be lost on ending it. Time, shared friends, property, children, a joint identity.

The model predicts that commitment is high when satisfaction is high, alternatives look poor, and investment is large.

It has held up reasonably well across a considerable body of research, including meta-analytic work, and it explains something the simpler account cannot.

What it explains

People stay in unsatisfying relationships. On a simple model this is irrational; on this one it is predictable.

Low satisfaction combined with high investment and poor perceived alternatives produces high commitment despite unhappiness.

Which is uncomfortable and it accounts for a great deal of observed behaviour, including in relationships that are actively harmful.

Research applying the model to people in abusive relationships has found that investment and perceived alternatives predict staying, which has practical implications for how support is offered.

The alternatives component

The least discussed and the most manipulable.

Perceived quality of alternatives is not a fact about the world. It is a perception, and it can be influenced.

Someone isolated from friends, financially dependent, and repeatedly told they would not manage alone has a low perception of alternatives that was constructed rather than observed.

Which is one reason the isolation pattern in controlling relationships is so consistently reported: it operates directly on the component that determines whether someone leaves.

In ordinary relationships the same component operates more benignly. People with strong independent friendships and financial autonomy have better perceived alternatives, and are more likely to leave relationships that are not working.

That is generally a good thing, and it is worth understanding rather than treating independence as a threat to commitment.

Investment, and the sunk cost issue

Investment is real and it is not a reason to stay.

The years spent are gone regardless of the decision, and the only relevant question concerns the future.

The genuine exceptions are investments that continue to generate obligation — children, dependency, commitments made to other people — which are not sunk costs but present facts.

Distinguishing between the two honestly is the difficult part, since the feeling of having invested is identical in both cases.

What commitment does

Beyond predicting who stays.

Research finds committed partners engage in a set of behaviours that maintain the relationship: accommodating rather than retaliating when a partner behaves badly, willingness to sacrifice, and a tendency to derogate attractive alternatives.

That last one is a documented and slightly odd finding — committed people rate potential alternatives as less attractive than uncommitted people do, apparently without noticing they are doing it.

These behaviours in turn increase the other person's satisfaction, which increases their commitment. Commitment is partly self-sustaining, which is why relationships have momentum in both directions.

Saying it out loud

One practical implication.

Explicit commitment — stated intentions about the future — is associated with greater relationship stability, and there is evidence that ambiguity about the state of a relationship is itself corrosive.

Research on relationship progression has found that couples who make deliberate decisions about major transitions tend to fare better than those who slide into them without an explicit decision.

Moving in together because a lease ended, or having a child without a discussion, are transitions made by circumstance rather than by choice, and the difference appears in later outcomes.

Which argues for the unromantic practice of stating things explicitly: what this is, where it is going, what each person expects.

General information about relationships, not psychological advice. If you feel unable to leave a relationship, contact a domestic abuse service or emergency services in your area.