The 22nd International Dairy Congress was the first to offer to participants the opportunity to present their work in the form of a poster, the object being to include more contributions in the programme than there was time available for oral presentations. The posters were also intended to ~lace. up to a point, the brief communications that were received for. and published at. previous international dairy congresses but which had been criticized on various grounds. The Organizing Committee's criteria for the acceptance of a poster included the following : - the subject matter should not have appeared in print prior to the Congress - the poster should contain useful and mainly new information - the poster should have an adequate technical or scientific basis Authors whose posters were accepted were invited to display ~r material at the Congress and be present to explain it to interested participants. The texts presented are also publ­ ished in this volume. The International Dairy Federation is interested in the views of Congress participants and of readers of ~his volume as to the relative value of posters vs brief communications. Any comments will be kept for consideration when future Internat­ ional Congresses are planned : they should be sent to TDF Secretariat at the address below. IDF General Secretariat 41. square Vergote B-1040 Brussels September 1986 CON TEN T S MONDAY J. Kwiatkowski, M. Jurczak, M. Zajac / Effectiveness 1.