The Couples Satisfaction Index (CSI)
Funk, J. L. & Rogge, R. D. (2007). Testing the ruler with item response theory: Increasing precision of measurement for relationship satisfaction with the Couples Satisfaction Index. Journal of Family Psychology, 21, 572-583.
The Couples Satisfaction Index (CSI) is designed to assess relationship satisfaction in individuals currently in romantic relationships, including married, cohabiting, and dating couples. The CSI provides a comprehensive evaluation of relationship quality that captures both global satisfaction and specific dimensions of relationship functioning.