This document is a product of the Clean IT project and was published in January 2013. It reflects the combined views of the participants as a whole on how to reduce terrorist use of the Internet. Individual participants or the organizations they represent do not necessarily agree with all parts of the text. Some parts of the document might still trigger the need for further, detailed discussions. This document consists of three parts. The ‘Preamble’ was drafted by government participants only, because it is primarily a task of governments to describe the threat of terrorism, and how terrorists use the Internet, why it is difficult to reduce terrorist use of the Internet, and why public and private organizations should discuss and cooperate to reduce terrorist use of the Internet. The last section of the ‘Preamble’ (H) invites all organizations interested or involved to join in a permanent public-private dialogue, to commit to the general principles and/or choose which best practices to implement.