As is common practice at large observatories and following formal approval by the Rectoral Council of the IAC, observing time to be used at the discretion of the IAC Director is available on all CAT-controlled telescopes at the IAC Observatories. This is this known as Director’s Discretionary Time (DDT).
Tras la aprobación formal por el Consejo Rector del IAC, a partir del semestre 07B existe un tiempo discrecional de observación, habitual en los grandes observatorios, que podrá conceder el Director del IAC en todos los telescopios de los observatorios del IAC sujetos al CAT: el Tiempo Discrecional del Director (DDT).