Rui Abreu, Daniel G. Bobrow, Hoda Eldardiry, Alexander Feldman, John Hanley, Tomonori Honda, Johan de Kleer, Alexandre Perez, Dave Archer, David Burke. Diagnosing Advanced Persistent Threats: A Position Paper. In Yannick Pencolé, Louise Travé-Massuyès, Philippe Dague, editors, Proceedings of the 26th International Workshop on Principles of Diagnosis (DX-2015) co-located with 9th IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processes (Safeprocess 2015), Paris, France, August 31 - September 3, 2015. Volume 1507 of CEUR Workshop Proceedings, pages 193-200, CEUR-WS.org, 2015. [doi]