1. Proficiency testing – an excellent workshop in Borås

   • Paul De Bièvre

   Editorial Pages: 137 - 137

2. Bridging cultural gaps in quality assurance

   • U. Örnemark
   • Nick Boley
   • Jean-Claude Libeer

   Editorial Pages: 138 - 139

3. Proficiency testing in analytical chemistry, microbiology, and laboratory medicine – working group discussions on current status, problems, and future directions

   • U. Örnemark
   • Nick Boley
   • E. W. B. De Leer

   Review Paper Pages: 140 - 146

4. An error model for evaluation and interpretation of proficiency testing

   • Göran Nilsson

   General Paper Pages: 147 - 150

5. External quality assurance programmes in medical laboratories

   • Jean-Claude Libeer

   General Paper Pages: 151 - 153

6. Microbiological proficiency testing: a personal perspective

   • Keith Jewell

   General Paper Pages: 154 - 159

7. Uncertainty evaluation in proficiency testing: state-of-the-art, challenges, and perspectives

   • Adriaan M. H. van der Veen

   Practitioner’s Report Pages: 160 - 163

8. Economy of proficiency testing: reference versus consensus values

   • A. Baldan
   • Adriaan M. H. van der Veen
   • Derek Woods

   Practitioner’s Report Pages: 164 - 167

9. Anti-HIV quality assurance programs in Australia and the southeast Asian and Western Pacific regions

   • A. Gust
   • Sandy Walker
   • Elizabeth M. Dax

   Practitioner’s report Pages: 168 - 172

10. Determination of hydrocarbons in water – interlaboratory method validation before routine monitoring

    • P. Woitke
    • Reinhard Kreßner
    • Peter Lepom

    Practitioner’s Report Pages: 173 - 177

11. Experience with in-house PT-schemes in the chemical industry

    • Rainer A. Schmidt

    Practitioner"s Report Pages: 178 - 180

12. Definition of assigned values for proficiency tests in water analysis

    • M. Koch
    • Jörg W. Metzger

    Practitioner’s report Pages: 181 - 185

13. Environmental analysis in the Czech Republic: organisation of proficiency testing and its use in laboratory assessment

    • Eva Klokočníková
    • Alena Nižnanská
    • I. Koruna

    Practitioner’s Report Pages: 186 - 189

14. Proficiency testing as tool for ISO 17025 implementation in National Public Health Laboratory: a mean for improving efficiency

    • Zeev Dveyrin
    • Hilla Ben-David
    • Abraham Mates

    Practitioner’s report Pages: 190 - 194

15. Special issue of ”Química Analítica” devoted to ”Analytical Chemistry and Quality”

    • M. Valcárcel
    • A. Ríos

    Letter to the Editors Pages: 198 - 198

16. Information system and qualifying criteria for proficiency testing schemes

    • Manfred Golze

    Policies and Concepts Pages: 199 - 202

17. Accreditation of providers of proficiency testing schemes

    • Maree Stuart
    • Alan Squirrell

    Policies and Concepts Pages: 203 - 205

18. Interlinkages and recognition of proficiency-testing schemes

    • Nick Boley
    • Adriaan van der Veen
    • M. Golze

    Policies and Concepts Pages: 205 - 207

19. Proficiency testing in occupational and environmental health – Current practice and international initiatives for harmonisation

    • J. M. Christensen
    • Kirsten Byrialsen

    Policies and Concepts Pages: 207 - 210

20. Accreditation of proficiency-testing schemes in The Netherlands

    • Petronella Mathilda van Berkel

    Policies and Concepts Pages: 210 - 213

21. The sixth meeting of CCQM, April 2000

    • R. I. Wielgosz

    Meeting Report Pages: 213 - 214

22. International Symposium on Measurement Uncertainty in View of ISO 17025 Requirements, Budapest, Hungary, June 5–6, 2000

    • József Hlavay

    Meeting Report Pages: 215 - 215

23. Eighth International Symposium on biological and environmental reference materials (BERM-8) – Reference Materials for the 21st Century

    • Wayne R. Wolf
    • M. Stoeppler

    Meeting Report Pages: 216 - 216

24. CEN – Regional agreements

    International Bodies Pages: B195 - B195

25. BERM – international symposia series on biological and environmental reference materials

    • Markus Stoeppler

    International Bodies Pages: A195 - A195