This research is financed by Research and Consultancy Fund (RCF) offered by Local Government Training Institute (LGTI) Dodoma; Tanzania. Among several purposes; RCF focuses on improving research and consultancy activities in LGTI academic departments Abstract Theory of Reasoned Action (TRA) was employed in this study as fitting theory for investigating determination of Knowledge Sharing behavior. TRA is a choice theory that elucidates drive of executing behavior by emphasising the definite processes that employees follow to take choices. TRA takes an employee drive to execute behavior by utilizing the concept of intention to execute behaviour. A TRA model was crafted on three variables [(Job Involvement (JI); Organizational Citizenship Behavior (OCB) and Knowledge Sharing (KS)] and empirically investigated Job Involvement - Knowledge Sharing association. Then, OCB moderating role in this association; was tested as an extension variable to the traditional TRA model. Questionnaires were completed on self-rating fashion where 421 employees in Local Government Authorities (LGAs) formed study sample. Hayes (2004) and Mod-Graph (Jose, 2013) approach was jointly employed to determine potential OCB moderation role in the study. Results suggested; Job Involvement - Knowledge Sharing association was positive in nature; thus, both changes in tandem. Further, Job Involvement - Knowledge Sharing association strength depended on the third variable namely OCB; hence, OCB affected the strength of the independent and dependent variable association in the study. Implications for practice and future study were composed subsequent to conclusions.
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