Validation of Scales Measuring Teacher Disposition, Altruistic Behavior, and Work-Related Quality of Life among In-Service Teachers in Myanmar

This study aimed to validate three measurement instruments, the Teacher Disposition Scale (TDS), the Teacher Altruistic Behavior Scale (TAB), and the Work-Related Quality of Life Scale (WRQoL) for use with in-service teachers in the Yangon Region, Myanmar. A total of 672 in-service teachers from public and private schools participated in the pilot study. Confirmatory Factor Analysis (CFA) was conducted using IBM AMOS to assess the factor structures, while convergent and discriminant validities were evaluated through Composite Reliability (CR), Average Variance Extracted (AVE), and the Heterotrait-Monotrait (HTMT) ratio. The CFA results indicated that all three models achieved acceptable fit indices after theoretically justified modifications. The TDS demonstrated a five-factor structure with a Cronbach's alpha of 0.917. The TAB demonstrated a four-factor structure with an alpha of 0.825. The WRQoL demonstrated a six-factor structure with an alpha of 0.863. Although some subscales exhibited AVE values slightly below the 0.50 threshold, composite reliability remained acceptable, and all items were retained to preserve content validity. The HTMT analysis further confirmed the discriminant validity of the constructs. The findings indicate that the TDS, TAB, and WRQoL are psychometrically sound and reliable instruments suitable for evaluating teacher disposition, altruistic behavior, and quality of work life in the Myanmar educational context.