http://www.sustainabilityhttp://www.sustainability2011.bayer.com/bl158 http://www.sustainability2011.bayer.com/bl160 http://www.sustainability2011.bayer.com/bl161 http://www.sustainability2011.bayer.com/bl162 http://www.sustainability2011.bayer.com/bl163 http://www.sustainability2011.bayer.com/bl164 Our engagement We have been engaged to perform a limited assurance engagement on all parts of the Bayer Sustainable Development Report (hereinafter: the report) for the reporting period from January 1, 2011 to December 31, 2011.