2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/18944I consider general connections between chaotic and quantum chaotics dynamics in single particles, and the effect of adding comparable ``chaos-inducing'' potentials to a Bose-condensed system, considering in particular concepts of integrability and the effect of particle loss from the condensate mode.Proceedings from the ``Quantum Challenges'' meeting in Essen (2001). To be published in a special issue of Journal of Modern OpticsSoft Condensed Mattertext