The study developed 2 measures of belongingness based on H. Kohut's (1984) self psychology theory. The Social Connectedness Scale and the Social Assurance Scale were constructed with a split-sample procedure on 626 college students. Internal reliability estimates for the 2 scales were .91 and .82, respectively. Test-retest correlations revealed good test stability over a 2-week period ( rs = .96 and .84, respectively). Cross-validation for the 2 measures was achieved with confirmatory factor analysis with an incremental fit index greater than .90. Scale functions are described and results are discussed in light of current research and theory.