How Do Close Relationships Form and Function?

From friendship and attraction to mutual dependence, responsiveness, and social conditions.

Level: Introductory
Reading load: 9 core readings in 5 units
Prerequisites: No methods course is required. The guides introduce the distinctions needed to compare theories, repeated observations, and predictive models. How Do Other People and Social Situations Shape Us? is useful preparation. The path considers friendship and romantic relationships without assuming one relationship arrangement is the norm.
Last reviewed: September 2026

Introduction

Closeness is made between people, within conditions neither person wholly commands. Opportunities to meet, time together, expectations, alternatives, and material circumstances shape what a relationship can become. Even its apparent success contains different questions: feeling close, remaining together, and finding satisfaction are distinct outcomes. This path asks how relationships form and function while keeping those distinctions in view.

Begin with friendship formation and initial attraction, then use frameworks about how partners' outcomes depend on one another and how expectations about closeness and support shape interaction to ask what each person brings to it. A study of roommates makes responsiveness a question about both experience and reciprocal influence. Reviews of conflict and a large predictive study distinguish maintaining satisfaction from explaining change. The final unit places these processes within socioeconomic and cultural conditions.

By the end, you should be able to distinguish partner selection from partner influence, identify who reports what in a study of both people in a relationship, compare satisfaction with commitment and persistence, and assess whether evidence supports the relationship outcome claimed. The longer articles may take several sittings; the guides help you follow their reasoning without reproducing every calculation.

Unit 1 of 5

How do relationships begin?

Contact offers possibilities without guaranteeing closeness. Compare friendship's shared time and activity with reported ideals and attraction during dating. In both cases, ask how people select interactions and how interaction might change what they want.

Reading
1 of 9
How Many Hours Does It Take to Make a Friend?
Hall, J. A. (2019). How many hours does it take to make a friend? Journal of Social and Personal Relationships, 36(4), 1278–1296. https://doi.org/10.1177/0265407518761225
Methodological contribution · Moderate · Full work: 19 pages
Connect opportunities for contact with what people do together.
Why you’re reading it. Give friendship formation its own evidence and distinguish time from a causal ingredient.
A question to consider. How could a newcomer who already likes someone both spend more time with them and later report greater closeness?
Reading
2 of 9
Sex Differences in Mate Preferences Revisited
Eastwick, P. W., & Finkel, E. J. (2008). Sex differences in mate preferences revisited: Do people know what they initially desire in a romantic partner? Journal of Personality and Social Psychology, 94(2), 245–264. https://doi.org/10.1037/0022-3514.94.2.245
Landmark empirical study · Critical reappraisal · Challenging · Full work: 20 pages
Compare stated preferences with desire during actual encounters.
Why you’re reading it. Add partner selection to the question of opportunity.
A question to consider. What would distinguish an appealing first encounter from the beginning of an enduring relationship, and how would you measure both?

Unit 2 of 5

What does interdependence explain?

Once people interact, each person's possibilities depend partly on the other. Interdependence theory locates those constraints; attachment theory adds expectations about availability and support under stress. Compare features of a situation with the meanings people bring to it.

Reading
3 of 9
Why We Need Interdependence Theory
Rusbult, C. E., & Van Lange, P. A. M. (2008). Why we need interdependence theory. Social and Personality Psychology Compass, 2(5), 2049–2070. https://doi.org/10.1111/j.1751-9004.2008.00147.x
Foundational argument · Major synthesis · Moderate · Full work: 22 pages
Map whose actions affect whose outcomes and which alternatives exist.
Why you’re reading it. Separate relationship structure from a list of personal characteristics.
A question to consider. Two friends disagree about a shared commitment. How might unequal alternatives change the meaning of the same agreement?
Reading
4 of 9
Adult Attachment, Stress, and Romantic Relationships
Simpson, J. A., & Rholes, W. S. (2017). Adult attachment, stress, and romantic relationships. Current Opinion in Psychology, 13, 19–24. https://doi.org/10.1016/j.copsyc.2016.04.006
Major synthesis · Foundational argument · Moderate · Full work: 6 pages
Follow how stress and a partner's response qualify predictions from attachment orientations.
Why you’re reading it. Connect expectations with interaction rather than assigning fixed personality types.
A question to consider. What would you need to observe before attributing withdrawal to an enduring orientation rather than the situation or partner's response?

Unit 3 of 5

How do people become responsive partners?

Responsiveness involves feeling understood, valued, and cared for, but a feeling is not a direct record of another person's behavior. This substantial roommate study introduces the framework and then traces reports from both people over time. Follow one pathway at a time, keeping intentions, actions, and perceptions separate.

Reading
5 of 9
Creating Good Relationships: Responsiveness, Relationship Quality, and Interpersonal Goals
Canevello, A., & Crocker, J. (2010). Creating good relationships: Responsiveness, relationship quality, and interpersonal goals. Journal of Personality and Social Psychology, 99(1), 78–106. https://doi.org/10.1037/a0018186
Methodological contribution · Landmark empirical study · Challenging · Full work: 29 pages
Use the responsiveness framework to separate projection from reciprocal influence.
Why you’re reading it. Apply interdependence to a nonromantic relationship and inspect what reports from both people add.
A question to consider. Both roommates report greater care after a less stressful week. Which pathways could reflect their interaction, and which could reflect a shared change in circumstances?

Unit 4 of 5

How are relationships maintained or strained?

An interaction can feel unpleasant while addressing a problem, or reassuring while leaving it unresolved. Compare a contextual account of communication with a large study of prediction. Keep immediate feelings, relationship quality, persistence, and change distinct.

Reading
6 of 9
What Type of Communication During Conflict Is Beneficial for Intimate Relationships?
Overall, N. C., & McNulty, J. K. (2017). What type of communication during conflict is beneficial for intimate relationships? Current Opinion in Psychology, 13, 1–5. https://doi.org/10.1016/j.copsyc.2016.03.002
Critical reappraisal · Major synthesis · Accessible · Full work: 5 pages
Compare a communication pattern's short-term and longer-term consequences.
Why you’re reading it. Test the assumption that an apparently positive interaction is necessarily beneficial.
A question to consider. How would financial constraints alter your interpretation of a direct request to change a partner's working hours?
Reading
7 of 9
Predicting Relationship Quality Across 43 Longitudinal Couples Studies
Joel, S., Eastwick, P. W., Allison, C. J., Arriaga, X. B., Baker, Z. G., Bar-Kalifa, E., Bergeron, S., Birnbaum, G. E., Brock, R. L., Brumbaugh, C. C., Carmichael, C. L., Chen, S., Clarke, J., Cobb, R. J., Coolsen, M. K., Davis, J., de Jong, D. C., Debrot, A., DeHaas, E. C., … Wolf, S. (2020). Machine learning uncovers the most robust self-report predictors of relationship quality across 43 longitudinal couples studies. Proceedings of the National Academy of Sciences, 117(32), 19061–19071. https://doi.org/10.1073/pnas.1917036117
Major synthesis · Methodological contribution · Challenging · Full work: 11 pages
Distinguish predicting satisfaction levels from predicting change.
Why you’re reading it. Assess how much a broad set of baseline measures can establish about relationship trajectories.
A question to consider. Why could a measure predict later satisfaction yet offer little help in identifying whose satisfaction will rise or fall?

Scope and omissions

This path explains formation, mutual dependence, responsiveness, maintenance, and social context. It is not advice for choosing a partner, a diagnostic account of attachment, or a course in couple therapy. Childhood caregiving, sexuality, bereavement, kinship, and relationship violence require additional treatment; relationship persistence is not assumed to be a desirable outcome.

Friendship and roommate research keep nonromantic relationships substantive, but much of the couple evidence concerns heterosexual relationships in Western societies. The cross-society study broadens the settings without creating representative national samples. An optional historical review of gay and lesbian couples opens another comparison; it does not fill every gap concerning sexual and gender diversity or current social conditions.

Synthesis

Close relationships develop through opportunities, selection, and continuing interaction. Interdependence connects each person's options and outcomes; attachment and responsiveness bring expectations, interpretations, and exchanges of care into the account. These processes occur within material and social circumstances. Understanding a relationship requires attention to their connections, rather than allowing either the individuals or their setting to explain everything alone.

The evidence also requires distinctions. Feeling understood is not identical to being accurately understood. Commitment is not satisfaction. Predicting a satisfaction score is not explaining its change, and an association is not an intervention. No single study supplies a universal formula for a good relationship.

Consider two newcomers who become close. Specify an explanation based on selection, one based on reciprocal influence, and one based on their circumstances. Identify who would supply each measure, how observations over time could distinguish the explanations, and which outcome—closeness, support, satisfaction, or persistence—you actually want to understand.

Continue with How Do Groups Shape Identity and Collective Action? to move from close relationships to membership, coordination, group decisions, leadership, and collective change.

For the developmental origins and changing forms of social relationships, continue with How Do Relationships and Social Understanding Develop?. For a broader view of social explanation, return to How Do Other People and Social Situations Shape Us?.