Intimacy-Passion-Commitment Triangle (Sternberg)

Robert Sternberg's Triangular Theory of Love identifies three components—intimacy (emotional closeness, bonding, connectedness), passion (physical attraction, sexual desire, romantic arousal), and commitment (decision to love and maintain the relationship)—that combine in different proportions to produce seven types of love: liking (intimacy only), infatuation (passion only), empty love (commitment only), romantic love (intimacy + passion), companionate love (intimacy + commitment), fatuous love (passion + commitment), and consummate love (all three). The practical insight is that these components follow different temporal trajectories in relationships: passion peaks early and declines, intimacy grows gradually, and commitment develops in steps.

When to use it

When relationship dissatisfaction needs diagnosis rather than wholesale relationship evaluation. When the natural evolution of love's composition is being misinterpreted as love's death. When prioritizing relationship investments and needing a framework for where to focus. When professional engagement shifts and you need to understand which dimension has changed.

How it can help

For knowledge workers who think analytically about relationships, Sternberg's model provides a diagnostic framework. Use it to: (1) assess which component is depleted in a struggling relationship rather than declaring the whole relationship broken, (2) understand that the natural decline of passion doesn't mean the relationship is failing—the composition of love is shifting, not dying, (3) invest in the component that's most depleted: if intimacy is low, prioritize emotional connection; if passion is low, prioritize novelty and desire; if commitment is low, clarify and recommit, (4) apply the framework to professional passion: enthusiasm for a role (passion) may decline while expertise.