The books on "Safety Assessment of Transgenic Organisms" constitute a compilation of the OECD Biosafety Consensus Documents. When published, Volume 1 and 2 contained the documents issued before 2006; Volume 3 and 4 are a continuation of the compilation up to 2010. The OECD Biosafety Consensus Documents identify elements of scientific information used in the environmental safety and risk assessment of transgenic organisms which are common to OECD member countries and some non members associated with the work. This is intended to encourage information sharing, promote harmonised practices, and prevent duplication of effort among countries. These books offer ready access to those consensus documents which have been issued on the website thus far. As such, it should be of value to applicants for commercial uses of transgenic organisms (crops, trees, microorganisms), to regulators and risk assessors in national authorities, as well as the wider scientific community. More information on the OECD's work related to the biosafety of transgenic organisms is found at BioTrack Online (http://www.oecd.org/biotrack).