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NotesPsychologyTopic 3.3Interpersonal relationships
Back to Psychology Topics
3.3.12 min read

Interpersonal relationships

IB Psychology • Unit 3

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Contents

  • Why we form relationships
  • Three explanations of attraction
  • Evaluating the explanations
In one line: Why we're drawn to some people and not others can be explained through biology, thinking, and social context.

In the human relationships context, a key area of study is how interpersonal relationships form, are maintained and end. As always, all three approaches offer explanations, and the fullest picture combines them.

This links to the concept of perspective: attraction and relationships look different through each lens. Studies are illustrative — use hypothetical or real examples in your own words.

Memory hook: Body, mind, world — even in love. Relationships have biological, cognitive and social explanations.

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Key idea: Each approach explains a different part of why relationships form.

Explaining relationships

1

Biological

Evolutionary and hormonal factors — attraction cues and bonding chemistry that support pair-bonding and reproduction.

2

Cognitive

How we think about a partner — perceived similarity, positive attributions, and beliefs about the relationship.

3

Sociocultural

Proximity, familiarity, social norms and cultural expectations (e.g. arranged vs individual-choice relationships).

Biology · Thinking · Society

Take two people who become close at work. Biological: bonding chemistry as they spend time together. Cognitive: they see each other as similar and interpret each other's behaviour positively. Sociocultural: proximity and shared social circles. Each perspective explains part of the attraction.

Go further — higher-level insight: Proximity and similarity are surprisingly powerful. We tend to like people we see often (familiarity) and who seem similar to us. Recognising these everyday social factors — not just 'chemistry' — is a strong, evidence-based point.

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Key idea: Each explanation has support and limits, and relationships vary a lot across cultures.

So each approach explains part of how relationships work, but none is complete. A strong evaluation notes that relationships vary enormously across cultures — from individual-choice to arranged — which warns against assuming Western relationship norms are universal (an imposed-etic risk), and argues for an integrative view.

Watch out: Don't assume one culture's relationships are the norm. What counts as a 'good' or 'normal' relationship varies by culture — applying one culture's model universally is ethnocentric.

IB Exam Questions on Interpersonal relationships

Practice with IB-style questions filtered to Topic 3.3.1. Get instant AI feedback on every answer.

Practice Topic 3.3.1 QuestionsBrowse All Psychology Topics

How Interpersonal relationships Appears in IB Exams

Examiners use specific command terms when asking about this topic. Here's what to expect:

Define

Give the precise meaning of key terms related to Interpersonal relationships.

AO1
Describe

Give a detailed account of processes or features in Interpersonal relationships.

AO2
Explain

Give reasons WHY — cause and effect within Interpersonal relationships.

AO3
Evaluate

Weigh strengths AND limitations of approaches in Interpersonal relationships.

AO3
Discuss

Present arguments FOR and AGAINST with a balanced conclusion.

AO3

See the full IB Command Terms guide →

Related Psychology Topics

Continue learning with these related topics from the same unit:

3.1.1Explaining mental health disorders
3.1.2Preventing and treating health problems
3.2.1Development of the self: attachment
3.2.2Influences on development
View all Psychology topics

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9 practice questions on Interpersonal relationships

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