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This review was initiated by Dr. Morton Satin in FAO Rome, Chief of the Food and Agricultural Industries Services in the Agricultural Service Division, as a result of many requests for information on BIOGAS TECHNOLOGY suitable for Developing Countries. The generous help and collaboration of the FAO staff during the preparation of the review and their help in contacting people in the Far East are gratefully acknowledged.

The most important of all are the researchers and technologists who are involved in the Biogas development. They are the key people to achieve the sustainable development so many people are referring to. Their work and research which is quoted in this review presents only a small portion of the important progress in Biogas technology and all my thanks are due to them.