My sincere thanks go to Peter Graaff, WHO/MEDP Project Coordinator for reviewing various drafts of this document and for his extensive, carefully considered and valuable comments.
Thanks are also due to Professor Roma Khonje, Controller of Health Technical Support Services, Ministry of Health, Malawi, for kindly reviewing the final version and facilitating Malawi Government
clearance for its subsequent publication.
C J Forshaw
Lilongwe, Malawi
July 1994