Civic duty and career outcomes in a career-based system: a two-wave, multisource study

References

• Ali, S. B., S. Bishu, and M. Alkadry. 2018. “Why Men and Women Want to Leave? Turnover Intent among Public Procurement Officers.” The American Review of Public Administration 48 (7):668–84. doi: 10.1177/0275074018771744.
   Web of Science ®Google Scholar
• An, S.-H. 2019. “Employee Voluntary and Involuntary Turnover and Organizational Performance: Revisiting the Hypothesis from Classical Public Administration.” International Public Management Journal 22 (3):444–69. doi: 10.1080/10967494.2018.1549629.
   Web of Science ®Google Scholar
• Aryee, S., Y. W. Chay, and J. Chew. 1994. “An Investigation of the Predictors and Outcomes of Career Commitment in Three Career Stages.” Journal of Vocational Behavior 44 (1):1–16. doi: 10.1006/jvbe.1994.1001.
   Web of Science ®Google Scholar
• Asseburg, J., J. Hattke, D. Hensel, F. Homberg, and R. Vogel. 2020. “The Tacit Dimension of Public Sector Attraction in Multi-Incentive Settings.” Journal of Public Administration Research and Theory 30 (1):41–59. doi: 10.1093/jopart/muz004.
   Web of Science ®Google Scholar
• Asseburg, J., and F. Homberg. 2020. “Public Service Motivation or Sector Rewards? Two Studies on the Determinants of Sector Attraction.” Review of Public Personnel Administration 40 (1):82–111. doi: 10.1177/0734371X18778334.
   Web of Science ®Google Scholar
• Audenaert, M., B. George, and A. Decramer. 2019. “How a Demanding Employment Relationship Relates to Affective Commitment in Public Organizations: A Multilevel Analysis.” Public Administration 97 (1):11–27. doi: 10.1111/padm.12378.
   Web of Science ®Google Scholar
• Bach, T., and S. Veit. 2018. “The Determinants of Promotion to High Public Office in Germany: Partisan Loyalty, Political Craft, or Managerial Competencies?” Journal of Public Administration Research and Theory 28 (2):254–69.
   Web of Science ®Google Scholar
• Baird, L., and I. Meshoulam. 1988. “Managing Two Fits of Strategic Human Resource Management.” Academy of Management Review 13 (1):116–28. doi: 10.5465/amr.1988.4306802.
   Web of Science ®Google Scholar
• Ballout, H. I. 2009. “Career Commitment and Career Success: Moderating Role of Self-Efficacy.” Career Development International 14 (7):655–70. doi: 10.1108/13620430911005708.
   Web of Science ®Google Scholar
• Baron, J. N., A. Davis-Blake, and W. T. Bielby. 1986. “The Structure of Opportunity: How Promotion Ladders Vary within and among Organizations.” Administrative Science Quarterly 31 (2):248–73. doi: 10.2307/2392790.
   Web of Science ®Google Scholar
• Baron, R. M., and D. A. Kenny. 1986. “The Moderator–Mediator Variable Distinction in Social Psychological Research: Conceptual, Strategic, and Statistical Considerations.” Journal of Personality and Social Psychology 51 (6):1173–82. doi: 10.1037/0022-3514.51.6.1173.
   PubMed Web of Science ®Google Scholar
• Bartels, H.-P. 2019. Unterrichtung durch den Wehrbeauftragten. Jahresbericht 2018 (60. Bericht). Berlin: Deutscher Bundestag.
   Google Scholar
• Blau, G. J. 1985. “The Measurement and Prediction of Career Commitment.” Journal of Occupational Psychology 58 (4):277–88. doi: 10.1111/j.2044-8325.1985.tb00201.x.
   Web of Science ®Google Scholar
• Blau, G. J. 1989. “Testing Generalizability of a Career Commitment Measure and Its Impact on Employee Turnover.” Journal of Vocational Behavior 35 (1):88–103. doi: 10.1016/0001-8791(89)90050-X.
   Web of Science ®Google Scholar
• Blau, P. M. 1964. Exchange and Power in Social Life. New York: John Wiley.
   Google Scholar
• Bowen, D. E., and C. Ostroff. 2004. “Understanding HRM–Firm Performance Linkages: The Role of the “Strength” of the HRM System.” Academy of Management Review 29 (2):203–21.
   Web of Science ®Google Scholar
• Braender, M., and L. B. Andersen. 2013. “Does Deployment to War Affect Public Service Motivation? A Panel Study of Soldiers before and after Their Service in Afghanistan.” Public Administration Review 73 (3):466–77. doi: 10.1111/puar.12046.
   Web of Science ®Google Scholar
• Buchanan, B. 1975. “Red-Tape and the Service Ethic. Some Unexpected Differences between Public and Private Managers.” Administration & Society 6 (4):423–44. doi: 10.1177/009539977500600403.
   Web of Science ®Google Scholar
• Burke, R. J., A. J. Boblet, and C. L. Cooper. 2013. Human Resource Management in the Public Sector. Cheltenham: Elgar.
   Google Scholar
• Carson, K. D., and P. P. Carson. 1998. “Career Commitment, Competencies, and Citizenship.” Journal of Career Assessment 6 (2):195–208. doi: 10.1177/106907279800600206.
   Web of Science ®Google Scholar
• Cherniss, C. 1991. “Career Commitment in Human Service Professionals: A Biographical Study.” Human Relations 44 (5):419–37. doi: 10.1177/001872679104400501.
   Web of Science ®Google Scholar
• Cho, Y. J., and G. B. Lewis. 2012. “Turnover Intention and Turnover Behavior: Implications for Retaining Federal Employees.” Review of Public Personnel Administration 32 (1):4–23. doi: 10.1177/0734371X11408701.
   Web of Science ®Google Scholar
• Choi, Y., and I. H. Chung. 2018. “Effects of Public Service Motivation on Turnover and Job Satisfaction in the US Teacher Labor Market.” International Journal of Public Administration 41 (3):172–80. doi: 10.1080/01900692.2016.1256306.
   Web of Science ®Google Scholar
• Christensen, R. K., L. Paarlberg, and J. L. Perry. 2017. “Public Service Motivation Research: Lessons for Practice.” Public Administration Review 77 (4):529–42. doi: 10.1111/puar.12796.
   Web of Science ®Google Scholar
• Christensen, R. K., and B. E. Wright. 2011. “The Effects of Public Service Motivation on Job Choice Decisions: Disentangling the Contributions of Person-Organization Fit and Person-Job Fit.” Journal of Public Administration Research and Theory 21 (4):723–43. doi: 10.1093/jopart/muq085.
   Web of Science ®Google Scholar
• Cohen, G., R. S. Blake, and D. Goodman. 2016. “Does Turnover Intention Matter? Evaluating the Usefulness of Turnover Intention Rate as a Predictor of Actual Turnover Rate.” Review of Public Personnel Administration 36 (3):240–63. doi: 10.1177/0734371X15581850.
   Web of Science ®Google Scholar
• Colarelli, S. M., and R. C. Bishop. 1990. “Career Commitment: Functions, Correlates, and Management.” Group & Organization Studies 15 (2):158–76. doi: 10.1177/105960119001500203.
   Web of Science ®Google Scholar
• Cooper-Hakim, A., and C. Viswesvaran. 2005. “The Construct of Work Commitment: Testing an Integrative Framework.” Psychological Bulletin 131 (2):241–59. doi: 10.1037/0033-2909.131.2.241.
   PubMed Web of Science ®Google Scholar
• Coyle-Shapiro, J. A.-M., and I. Kessler. 2003. “The Employment Relationship in the UK Public Sector: A Psychological Contract Perspective.” Journal of Public Administration Research and Theory 13 (2):213–30. doi: 10.1093/jopart/mug018.
   Web of Science ®Google Scholar
• Cropanzano, R., and M. S. Mitchell. 2005. “Social Exchange Theory: An Interdisciplinary Review.” Journal of Management 31 (6):874–900. doi: 10.1177/0149206305279602.
   Web of Science ®Google Scholar
• Emerson, R. M. 1976. “Social Exchange Theory.” Annual Review of Sociology 2(1):335–62. doi: 10.1146/annurev.so.02.080176.002003.
   Web of Science ®Google Scholar
• Feeney, M. K., and J. Langer. 2016. “Getting Ahead in the Public Sector: Perceptions of Managers in US Municipalities.” The American Review of Public Administration 46 (6):683–99. doi: 10.1177/0275074015570037.
   Web of Science ®Google Scholar
• Feeney, M. K., and H. G. Rainey. 2010. “Personnel Flexibility and Red Tape in Public and Nonprofit Organizations: Distinctions Due to Institutional and Political Accountability.” Journal of Public Administration Research and Theory 20 (4):801–26. doi: 10.1093/jopart/mup027.
   Web of Science ®Google Scholar
• Giauque, D., A. Ritz, F. Varone, and S. Anderfuhren‐Biget. 2012. “Resigned but Satisfied: The Negative Impact of Public Service Motivation and Red Tape on Work Satisfaction.” Public Administration 90 (1):175–93. doi: 10.1111/j.1467-9299.2011.01953.x.
   Web of Science ®Google Scholar
• Gouldner, A. W. 1960. “The Norm of Reciprocity: Apreliminary Statement.” American Sociological Review 25(2):161–78. doi: 10.2307/2092623.
   Web of Science ®Google Scholar
• Gould‐Williams, J. S., P. Bottomley, T. Redman, E. Snape, D. J. Bishop, T. Limpanitgul, and A. M. S. Mostafa. 2014. “Civic Duty and Employee Outcomes: Do High Commitment Human Resource Practices and Work Overload Matter?” Public Administration 92 (4):937–53. doi: 10.1111/padm.12019.
   Web of Science ®Google Scholar
• Hammerschmid, G., R. E. Meyer, and C. Demmke. 2007. “Public Administration Modernization: Common Reform Trends or Different Paths and National Understandings in the EU Countries.” In Cultural Aspects of Public Management Reform, edited by Kuno Schedler and Isabella Proeller, 145–69. Bingley: Emerald
   Google Scholar
• Hattke, F., and J. Hattke. 2019. “Lead by Example? The Dissemination of Ethical Values through Authentic Leader Inspiration.” International Journal of Public Leadership 15 (4):224–37. doi: 10.1108/IJPL-06-2019-0034.
   Web of Science ®Google Scholar
• Hattke, F., R. Vogel, and J. Znanewitz. 2018. “Satisfied with Red Tape? Leadership, Civic Duty, and Career Intention in the Military.” Public Management Review 20 (4):563–86. doi: 10.1080/14719037.2017.1335341.
   Web of Science ®Google Scholar
• Hauff, S., D. Alewell, and N. Katrin Hansen. 2017. “HRM System Strength and HRM Target Achievement—toward a Broader Understanding of HRM Processes.” Human Resource Management 56 (5):715–29. doi: 10.1002/hrm.21798.
   Web of Science ®Google Scholar
• Hayes, A. F. 2013. Introduction to Mediation, Moderation, and Conditional Process Analysis: A Regression-Based Approach. New York: Guilford Press.
   Google Scholar
• Hayes, A. F., and M. Scharkow. 2013. “The Relative Trustworthiness of Inferential Tests of the Indirect Effect in Statistical Mediation Analysis: Does Method Really Matter?” Psychological Science 24 (10):1918–27. doi: 10.1177/0956797613480187.
   PubMed Web of Science ®Google Scholar
• Hayes, M. S., and E. C. Stazyk. 2019. “Mission Congruence: To Agree or Not to Agree, and Its Implications for Public Employee Turnover.” Public Personnel Management 48(4):513–34. forthcoming. doi: 10.1177/0091026019829847.
   Web of Science ®Google Scholar
• Hom, P. W., A. S. Tsui, J. B. Wu, T. W. Lee, A. Y. Zhang, P. P. Fu, and L. Li. 2009. “Explaining Employment Relationships with Social Exchange and Job Embeddedness.” The Journal of Applied Psychology 94 (2):277–97. doi: 10.1037/a0013453.
   PubMed Web of Science ®Google Scholar
• Homans, G. C. 1958. “Social Behavior as Exchange.” American Journal of Sociology 63(6):597–606. doi: 10.1086/222355.
   Web of Science ®Google Scholar
• Homberg, F., and J. Costello. 2019. Public Service Motivation and Civic Engagement: The Role of Pro-Social Motivations in Shaping Society. Cham: Palgrave Macmillan.
   Google Scholar
• Hsieh, C.-W. 2019. “More Blessed to Give than to Receive: Evidence of the Altruism–Promotion Relationship from Female Taiwanese Civil Servants.” Public Performance & Management Review 42 (6):1396–417. doi: 10.1080/15309576.2019.1572021.
   Web of Science ®Google Scholar
• Ingraham, P. W., and S. Kim. 2012. Public Sector Human Resource Management. London: SAGE.
   Google Scholar
• Jin, R. Q., and H. G. Rainey. 2020. “Positive in Public Service: Government Personnel, Constrained Incentives, and Positive Work Attitudes.” International Public Management Journal 23 (1):25–56. doi: 10.1080/10967494.2019.1602572.
   Web of Science ®Google Scholar
• Jørgensen, T. B., and B. Bozeman. 2007. “Public Values: An Inventory.” Administration & Society 39 (3):354–81. doi: 10.1177/0095399707300703.
   Web of Science ®Google Scholar
• Kim, S. 2010. “Position Islands on the Career Sea: An Evaluation of the Open Competitive Position System in Korea.” Public Personnel Management 39 (3):243–58. doi: 10.1177/009102601003900304.
   Web of Science ®Google Scholar
• Kim, M., and T. A. Beehr. 2017. “Directing Our Own Careers, but Getting Help from Empowering Leaders.” Career Development International 22 (3):300–17. doi: 10.1108/CDI-11-2016-0202.
   Web of Science ®Google Scholar
• Kim, H., D.-S. Kang, S.-W. Lee, and G. McLean. 2016. “Career Commitment as a Mediator between Organization-Related Variables and Motivation for Training and Turnover Intentions.” Journal of Career Development 43 (2):130–44. doi: 10.1177/0894845315584160.
   Web of Science ®Google Scholar
• Kjeldsen, A. M., and C. B. Jacobsen. 2013. “Public Service Motivation and Employment Sector: Attraction or Socialization?” Journal of Public Administration Research and Theory 23 (4):899–926. doi: 10.1093/jopart/mus039.
   Web of Science ®Google Scholar
• Knies, E., and P. Leisink. 2014. “Linking People Management and Extra‐Role Behaviour: Results of a Longitudinal Study.” Human Resource Management Journal 24 (1):57–76. doi: 10.1111/1748-8583.12023.
   Web of Science ®Google Scholar
• Korac, S., I. Saliterer, and B. Weigand. 2019. “Factors Affecting the Preference for Public Sector Employment at the Pre-Entry Level: A Systematic Review.” International Public Management Journal 22 (5):797–840. doi: 10.1080/10967494.2018.1430086.
   Web of Science ®Google Scholar
• Laegreid, P., and L. R. Wise. 2015. “Transitions in Civil Service Systems: Robustness and Flexibility in Human Resource Management.” In Comparative Civil Service Systems in the 21st Century, edited by Frits M. Van der Meer, Jos C. N. Raadschelders and Theo A. J. Toonen, 203–22. London: Palgrave Macmillan.
   Google Scholar
• Leiter, M. P., D. Clark, and J. Durup. 1994. “Distinct Models of Burnout and Commitment among Men and Women in the Military.” The Journal of Applied Behavioral Science 30 (1):63–82. doi: 10.1177/0021886394301004.
   Google Scholar
• Lemire, L., T. Saba, and Y.-C. Gagnon. 1999. “Managing Career Plateauing in the Quebec Public Sector.” Public Personnel Management 28 (3):375–91. doi: 10.1177/009102609902800305.
   Web of Science ®Google Scholar
• Levy, J. S. 2008. “Case Studies: Types, Designs, and Logics of Inference.” Conflict Management and Peace Science 25(1):1–18. doi: 10.1080/07388940701860318.
   Web of Science ®Google Scholar
• Levy, Y. 2010. “The Essence of the ‘Market Army.’” Public Administration Review 70 (3):378–89. doi: 10.1111/j.1540-6210.2010.02152.x.
   Web of Science ®Google Scholar
• Lindenberg, S. 2001. “Intrinsic Motivation in a New Light.” Kyklos 54 (2‐3):317–42. doi: 10.1111/1467-6435.00156.
   Web of Science ®Google Scholar
• Maloney, P., M. J. Grawitch, and L. K. Barber. 2011. “Strategic Item Selection to Reduce Survey Length: Reduction in Validity?” Consulting Psychology Journal: Practice and Research 63 (3):162–75. doi: 10.1037/a0025604.
   Google Scholar
• McCarthy, D., P. Wei, F. Homberg, and V. Tabvuma. 2019. “Public Service Motivation in the Chinese Public and Private Sectors.” Evidence-Based HRM: a Global Forum for Empirical Scholarship. forthcoming. doi: 10.1108/EBHRM-06-2018-0039.
   Google Scholar
• OECD. 2009. Government at a Glance 2009. Paris: OECD Publishing.
   Google Scholar
• Paauwe, J., and P. Boselie. 2005. “HRM and Performance: What Next?” Human Resource Management Journal 15 (4):68–83. doi: 10.1111/j.1748-8583.2005.tb00296.x.
   Google Scholar
• Perry, J. L. 1996. “Measuring Public Service Motivation: An Assessment of Construct Reliability and Validity.” Journal of Public Administration Research and Theory 6 (1):5–22. doi: 10.1093/oxfordjournals.jpart.a024303.
   Google Scholar
• Perry, J. L., and W. Vandenabeele. 2015. “Public Service Motivation Research: Achievements, Challenges, and Future Directions.” Public Administration Review 75 (5):692–9. doi: 10.1111/puar.12430.
   Web of Science ®Google Scholar
• Perry, J. L., and L. R. Wise. 1990. “The Motivational Bases of Public Service.” Public Administration Review 50 (3):367–73. doi: 10.2307/976618.
   Web of Science ®Google Scholar
• Piatak, J. S. 2017. “Sector Switching in Good Times and in Bad: Are Public Sector Employees Less Likely to Change Sectors?” Public Personnel Management 46 (4):327–41. doi: 10.1177/0091026017712739.
   Web of Science ®Google Scholar
• Piatak, J. S., S. E. Sowa, W. S. Jacobson, and J. McGinnis Johnson. 2020. “Infusing Public Service Motivation (PSM) throughout the Employment Relationship: A Review of PSM and the Human Resource Management Process.” International Public Management Journal. forthcoming. doi: 10.1080/10967494.2020.1805381
   Web of Science ®Google Scholar
• Ployhart, R. E., and W. I. MacKenzie. Jr. 2015. “Two Waves of Measurement Do Not a Longitudinal Study Make.” In More Statistical and Methodological Myths and Urban Legends. Doctrine, Verity and Fable in Organizational and Social Sciences, edited by Charley E. Lance and Robert J. Vandenberg, 85–99. New York: Routledge/Taylor & Francis.
   Google Scholar
• Pollitt, C., and G. Bouckaert. 2017. Public Management Reform: A Comparative Analysis - into the Age of Austerity. 4th Ed. Oxford, Oxford University Press.
   Google Scholar
• Poon, J. M. L. 2004. “Career Commitment and Career Success: Moderating Role of Emotion Perception.” Career Development International 9 (4):374–90. doi: 10.1108/13620430410544337.
   Google Scholar
• Richter, G. 2016. “Wie Attraktiv ist die Bundeswehr als Arbeitgeber?” Forschungsbericht (No. 113). Potsdam: Zentrum für Militärgeschichte und Sozialwissenschaften der Bundeswehr.
   Google Scholar
• Ritz, A., G. A. Brewer, and O. Neumann. 2016. “Public Service Motivation: A Systematic Literature Review and Outlook.” Public Administration Review 76 (3):414–26. doi: 10.1111/puar.12505.
   Web of Science ®Google Scholar
• Schott, C., T. Steen, and D. D. Van Kleef. 2019. “Reality Shock and Public Service Motivation: A Longitudinal, Qualitative Study among Dutch Veterinary Inspectors.” International Journal of Public Administration 42 (6):468–81. doi: 10.1080/01900692.2018.1485044.
   Web of Science ®Google Scholar
• Snape, E., and T. Redman. 2010. “HRM Practices, Organizational Citizenship Behaviour, and Performance: A Multi-Level Analysis.” Journal of Management Studies 47 (7):1219–47. doi: 10.1111/j.1467-6486.2009.00911.x.
   Web of Science ®Google Scholar
• Snell, S., and S. Morris. 2019. “Time for Realignment: The HR Ecosystem.” Academy of Management Perspectives forthcoming. doi: 10.5465/amp.2018.0069.
   Google Scholar
• Spector, P. E., and M. T. Brannick. 2011. “Methodological Urban Legends: The Misuse of Statistical Control Variables.” Organizational Research Methods 14 (2):287–305. doi: 10.1177/1094428110369842.
   Web of Science ®Google Scholar
• Stanton, J. M., E. F. Sinar, W. K. Balzer, and P. C. Smith. 2002. “Issues and Strategies for Reducing the Length of Self-Report Scales.” Personnel Psychology 55 (1):167–94. doi: 10.1111/j.1744-6570.2002.tb00108.x.
   Web of Science ®Google Scholar
• Su, R., C. Murdock, and J. Rounds. 2015. “Person-Environment Fit.” In APA Handbook of Career Intervention, edited by Paul J. Hartung, Mark L. Savickas and W. Bruce Walsh, 81–98. Washington, DC: American Psychological Association.
   Google Scholar
• Themba, M. A., M. Coetzee, and R. M. Oosthuizen. 2012. “Exploring Sociodemographic Differences in Career Maturity in the South African Military.” South African Journal of Labour Relations 36 (1):8–30.
   Google Scholar
• Thompson, J. A., and R. K. Christensen. 2018. “Bridging the Public Service Motivation and Calling Literatures.” Public Administration Review 78 (3):444–56. doi: 10.1111/puar.12913.
   Web of Science ®Google Scholar
• Tsui, A. S., J. L. Pearce, L. W. Porter, and A. M. Tripoli. 1997. “Alternative Approaches to the Employee-Organization Relationship: Does Investment in Employees Pay Off?” Academy of Management Journal 40 (5):1089–121. doi: 10.5465/256928.
   Web of Science ®Google Scholar
• Tsui, A. S., and J. B. Wu. 2005. “The New Employment Relationship versus the Mutual Investment Approach: Implications for Human Resource Management.” Human Resource Management 44 (2):115–21. doi: 10.1002/hrm.20052.
   Web of Science ®Google Scholar
• Van de Walle, S., B. Steijn, and S. Jilke. 2015. “Extrinsic Motivation, Psm and Labour Market Characteristics: A Multilevel Model of Public Sector Employment Preference in 26 Countries.” International Review of Administrative Sciences 81 (4):833–55. doi: 10.1177/0020852314563899.
   Web of Science ®Google Scholar
• van der Meer, F. M., T. Steen, and A. Wille. 2015. “Civil Service Systems in Western Europe: A Comparative Analysis.” In Comparative Civil Service Systems in the 21st Century, edited by Frits M. van der Meer, Jos C. N. Raadschelders and Theo A. J. Toonen, 38–56. Basingstoke: Palgrave Macmillan.
   Google Scholar
• Veit, S., and S. Scholz. 2016. “Linking Administrative Career Patterns and Politicization: Signalling Effects in the Careers of Top Civil Servants in Germany.” International Review of Administrative Sciences 82 (3):516–35. doi: 10.1177/0020852314564310.
   Web of Science ®Google Scholar
• Wayne, S. J., L. M. Shore, and R. C. Liden. 1997. “Perceived Organizational Support and Leader-Member Exchange: A Social Exchange Perspective.” Academy of Management Journal 40 (1):82–111.
   Web of Science ®Google Scholar
• Wiegold, T. 2016. "Im Auge behalten: Personalstärke Der Bundeswehr."Augengeradeaus.net. Retrieved December 3, 2019 (https://augengeradeaus.net/2016/01/im-auge-behalten-personalstaerke-der-bundeswehr/).
   Google Scholar
• Woodruff, T., R. Kelty, and D. R. Segal. 2006. “Propensity to Serve and Motivation to Enlist among American Combat Soldiers.” Armed Forces & Society 32 (3):353–66. doi: 10.1177/0095327X05283040.
   Web of Science ®Google Scholar
• Wright, B. E., S. Hassan, and R. K. Christensen. 2017. “Job Choice and Performance: Revisiting Core Assumptions about Public Service Motivation.” International Public Management Journal 20 (1):108–31. doi: 10.1080/10967494.2015.1088493.
   Web of Science ®Google Scholar
• Yang, W.-N., K. Niven, and S. Johnson. 2019. “Career Plateau: A Review of 40 Years of Research.” Journal of Vocational Behavior 110:286–302. doi: 10.1016/j.jvb.2018.11.005.
   Web of Science ®Google Scholar