<![CDATA[Research on emotional contagion has predominantly been conducted in Western cultures, raising concerns about the suitability of existing measurement instruments for the Indonesian collectivist context. This study aimed to adapt and evaluate the psychometric properties of the Emotional Contagion Scale (ECS) for Indonesian early adults. A quantitative instrument development approach was employed involving 157 participants aged 18–45 years who met predetermined inclusion criteria. Participants were recruited using purposive sampling. The adaptation process included conceptualization, expert judgment for content validation, pilot testing, reliability analysis using Cronbach’s Alpha and item–rest correlation, and construct validation through Confirmatory Factor Analysis (CFA). The initial instrument comprised 50 items representing five emotional dimensions: happiness, love, fear, anger, and sadness. Psychometric evaluation resulted in a final version consisting of 25 items. The adapted scale demonstrated high internal consistency (Cronbach’s Alpha = 0.888), while the retained items adequately represented their intended constructs. CFA supported the proposed five-factor structure with acceptable model fit across dimensions, although several items showed relatively low factor loadings and require further refinement. Overall, the Indonesian version of the Emotional Contagion Scale provides a valid and reliable instrument for assessing emotional contagion among Indonesian early adults and offers a culturally relevant tool for psychological research and practice.]]>
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