Uma Medida de Satisfação com o Relacionamento Amoroso

This study aimed to adapt the Investment Model of Commitment Processes Scale (Escala do Nível de Satisfação com o Relacionamento Amoroso - ENSRA - Rusbult, Martz, & Agnew, 1988) to the Brazilian context. In the first study (N = 269), we sought evidence of validity based on the unifactorial structure of the instrument and analyzed the properties of the items according to the item response theory. In the second study (N = 1498), a revised version of the scale (ENSRA-R) was proposed, including new items with higher difficulty parameters. Exploratory and confirmatory factor analyses indicated a single-factor structure for both the ENSRA and ENSRA-R. As theoretically expected the ENSRA and ENSRA-R correlated positively with another instrument that assesses relationship satisfaction and with romantic love, and negatively with the intention to break-up. Both versions of the instrument provide satisfactory evidence of validity and adequate accuracy, however, the ENSRA-R was more informative, covering a larger portion of the latent trait compared to the ENSRA.