Part 1 Biofilm Mode of Life: Limits of the biofilm concept and types of aquatic biofilms -- Laser microscopy for the study of biofilms: issues and options -- Interactions and communication within marine biofilms -- Microbial biodiversity in natural biofilms -- Aquatic biofilms and biogeochemical processes -- Part II Biofilms and Pollution: Benthic diatom monitoring and assessment of freshwater environments: standard methods and future challenges -- The use of biofilms to assess the effects of chemicals on freshwater ecosystems -- Biofilm development in sewer networks -- Part III New Technologies Using Biofilms: Biofilm biodegradation potential -- Electroactive biofilms in water and air pollution treatment -- Biofilms for one-stage autotrophic nitrogen removal