Sigma Paper No. 4: Management Control in Modern Government Administration: Some Comparative Practices (1996) Sigma Paper No. 6: Internationalisation of Policy-making (1996) Sigma Paper No. 9: Effective Communications Between the Public Service and the Media (1996) Sigma Paper No. 19: Effects of European Union Accession: Part I Budgeting and Financial Control (1998) Sigma Paper No. 20: Effects of European Union Accession: Part II External Audit (1998) Sigma Paper No. 21: Promoting Performance and Professionalism in the Public Service (1997) Sigma Paper No. 22: Management Challenges at the Centre of Government: Coalition Situations and Government Transitions (1998) Sigma Paper No. 27: European Principles for Public Administration (1999) Sigma Paper No. 31: Improving Policy Instruments through Impact Assessment (2001) Professionalism in Public Service Management: The Making of Highly Qualified, Efficient and Effective Public Managers (Sigma/OECD, 2002) PUMA Occasional Paper No. 14: Ethics in the Public Service -Current Issues and Practice (1996)