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Social interaction among employees is crucial at both an organizational and individual level. Demonstrating the value of recent methodological advances, 2 studies conducted in 2 workplaces and 2 countries sought to answer the following questions:(a) Do coworkers interact more with coworkers who have similar well-being? and, if yes,(b) what are the processes by which such affiliation occurs? Affiliation was assessed via 2 methodologies: a commonly used self-report measure (ie, mutual nominations by coworkers) complemented by a behavioral measure (ie, sociometric badges that track physical proximity and social interaction). We found that individuals who share similar levels of well-being (eg, positive affect, life satisfaction, need satisfaction, and job satisfaction) were more likely to socialize with one another. Furthermore, time-lagged analyses suggested that clustering in need satisfaction arises from mutual …