This guideline is an essential reference for factory laboratory, quality assurance, technical or hygiene staff. It provides detailed descriptions of hygiene methods for the environmental sampling of surfaces, people, the air and process waters. Also included for each method is a flow diagrams for easy reference in laboratories whilst work is in progress. The hygiene methods contained in the manual can be used as reference methods for laboratories undertaking the Campden Laboratory Accreditation Scheme or seeking accreditation to ISO/IEC 17025:1999. Contents include: General guidelines for sampling strategy and equipment, sample taking, transport, receipt and handling, and controls and risk analysis • Group 1 methods - surface sampling and assessment • Group 2 methods - air sampling • Group 3 methods - personnel • Group 4 methods - process water • Group 5 methods - packaging • Group 6 methods - verification