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The purpose of this study is to investigate the effect of organizational goal ambiguity (OGA) on public service motivation (PSM) considering the mediating role of job satisfaction (JS), performance appraisal (PA) and perceived organizational fairness (POF) in the Iranian public sector. This research also seeks to answer this question: to what extent PSM confirmed in Western countries is generalizable to the Iranian public sector?

A survey of 779 employees working in 16 ministries of Iran was administered. Confirmatory factor analysis (CFA) and hierarchical regression were applied to test the model and the mediators.

The results indicate that OGA negatively affects PSM, and this relationship is mediated by JS, PA and POF. Furthermore, the research findings have varied across ministries, contract type, positions and gender. Most importantly, the generalizability of the PSM construct is limited in the public sector of Iran since two of four dimensions of PSM were confirmed, that is, an attraction to public service and self-sacrifice (compassion).

This paper provides managers and decision makers with a clear understanding of the effects of context (including goal ambiguity, the importance of employee's attitudes and HR systems in shaping unique intrinsic motivation for public organizations) on employee's PSM. Also, these findings show how they can manage and motivate employees to engage in PSM. By clarifying organizational goals or making an association between job tasks and higher-level goals, practitioners can stimulate PSM at work.

This paper advances a new and further understanding of antecedent and mediators of PSM in Iran. Also, it provides an explanation of its generalizability and the role of organizational climate in fostering it.

The main purpose of this study is examining the relationship between organizational change capacity (OCC) and organizational performance (OP).

After extensive researches in organizational literature about change and performance, the OCC model from Judge and Douglas consists of eight dimensions (trustworthy leadership, involved mid-management, capable champions, innovative culture, trusting followers, systems thinking, accountable culture, and effective communication), and the OP model from Lee consists of six dimensions (stakeholders' satisfaction, organizational communication, organizational growth, strategic performance, knowledge management, and team collaboration); were considered. In order to test the hypothesis, a series of 130 qualified employees in a knowledge-based organization were questioned. The measurement tool was a two-part questionnaire (OCC and OP). Validity of questionnaire well approved based on face validity method by experts, specialists and professors of management. Using the results of pre-test, Cronbach's α was showed the very high reliability.

Moreover, the results of regression analysis showed that regression line ascribes changes in dependent variable (OP) to independent variable (OCC). It means that high percentage of change in OP (77.3 percent) will be explainable and predictable with OCC. Then, with utilizing of parametric and non-parametric tests, the relationship between OCC and OP; and between components of OCC and OP was investigated. Finally, Pearson and Spearman correlation tests results confirmed the significant relationships. Overall, the results of this study show the significant, positive, strong relationship between OCC and OP.

As not many studies have been done about the impact of organizational change on OP, the paper's findings will be useful to assess the adaptation ability of organization with changing environment and the impact of this adaptation on OP.