The PACS instrument is the result of many years of work by a large group of dedicated people in several institues and companies across Europe. It is their efforts that have made it possible to create such a powerful instrument for use in the Herschel Space Observatory. We would first like to acknowledge their work.

This manual is edited by Bruno Altieri and Roland Vavrek (ESAC) on behalf of the PACS ICC consortium. This Observer's Manual also uses the knowledge contained in numerous PACS technical documents and various discussions.