| Summary: | This paper investigates the goodness of the measure of organizational citizenship behaviour in terms of reliability and validity. Organizational Citizenship Behaviour considers as the extra role or voluntary behaviour not directly or explicitly recognized by the formal reward system, and that in the aggregate it promotes the effective functioning of the organization. However, more research studies on OCB focus on western context while similar effort in Sri Lankan context rather scant. Data were gathered through the survey by distributing structured questionnaire from public sector organizations. As per the discussion basically, two main criteria called reliability and validity have to be achieved to confirm the goodness of the measure. Internal reliability and composite reliability scales were commonly employed to asses construct reliability of the intended constructs. However, convergent validity achieved through Average Variance Extracted (AVE) and factor loadings. Discriminant validity can be evaluated by assessing the cross loadings among constructs, Fornel-Larcker criterion, and Heterotrait- Monotrait Ratio of correlation (HTMT). According to the derived outcomes implications regarding the goodness of measure were discussed and revisions of measurement in Sri Lankan context were presented.
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