| Summary: | The primary aim of the study was to examine the validity of the Indonesian version of the 23-item WhatsApp Social Support Scale (WSSC) adapted from an earlier study by Chung, Yang and Chen . A total of 214 in-service English as a foreign language (EFL) teachers across school levels in Indonesia participated in the study. Rasch statistical analyses were performed to validate the adapted questionnaire, including unidimensionality assessment, reliability analysis, Rasch model fit analysis, and differential functioning analysis. The findings of the study showed that WSSC primarily measured a single latent variable, that was, the online social support received by the English as a foreign language (EFL) teachers in the WhatsApp group. The Rasch analysis of the WSSC resulted that the scale fitted the Rasch model with high reliability levels for both person and item levels. Although redefining category 2–3 is required, an evaluation of WSSC items with DIF notes is suggested to improve the scale’s reliability.
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