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Investment Model Scale — IMS

Rusbult's Investment Model explains why people stay in relationships — or leave them. It examines four dimensions: satisfaction, investment size, quality of alternatives, and commitment level.

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Satisfaction

How fulfilling and enjoyable the relationship is

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Quality of Alternatives

How attractive options outside the relationship seem

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Investment Size

Resources, time, and life invested in the relationship

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Commitment

How committed you are to continuing the relationship

📚 Research basis

  • Rusbult, C. E., Martz, J. M., & Agnew, C. R. (1998). The Investment Model Scale. Personal Relationships, 5(4), 357–391.
  • Le, B., & Agnew, C. R. (2003). Commitment and its theorized determinants: A meta-analysis. Personal Relationships, 10(1), 37–57.

22 questions · ~5 minutes · 4 dimensions

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