This volume brings the revised version of the full collection of 38 essays covering James Robinson's studies on Q, from his 1964 break-through article on the genre of Q to the corpus of hotly debated contributions on Q 12,27 which he published between 1998 and 2002 and his detailed presentation of the 'Critical Edition of Q' (2002). Edited by C. Heil and J. Verheyden.