Introduction : transforming homeland security : a road map for the transatlantic alliance / Daniel S. Hamilton -- Homeland security and transformation : why it is essential to bring together both agendas / Heiko Borchert -- From territorial security to societal security : implications for the transatlantic strategic outlook / Esther Brimmer -- Transatlantic homeland security and the challenge of diverging risk perceptions / Gerd Föhrenbach -- The concept of homeland security in the European Union and in Austria - a challenge for the Austrian EU presidency / Gustav Gustenau -- What does the United States need to do? The United States and homeland security / Lawrence J. Korb -- Structures and cultures - civil military cooperation in homeland security : the Danish case / Anja Dalgaard-Nielsen -- The EU's approach to homeland security : balancing safety and European ideals / Gustav Lindstrom -- Defending critical infrastructure and systems / Sandra J. Bell -- Intelligence cooperation and homeland security / Yves Boyer -- Homeland security and the role of business / Pauline Neville-Jones and Neil Fisher