This Manual has been primarily designed for use by Tanzania laboratory personnel who participate in the Mycotoxin Monitoring Programme. It is hoped, however. that other specialists with an interest in mycotoxins will find this manual providing a useful introduction to the subject. It reviews, generally, the problems of mycotoxins and, particularly, aflatoxins as well as the methods used at the Government Chemist Laboratory for the analysis of foods and feeds for mycotoxin.