The existence of Q (simply defined as the non-Markan material common to Matthew and Luke) as a document in the earliest churches was first hypothesized by C. H. Weisse in 1838. The existence, character, and significance of Q as a document from the earliest churches has further been developed since then by numerous scholars, including the two groundbreaking Fortress Press books by John S. Kloppenborg Verbin: The Formation of Q (1987) and Excavating Q (2000).
Q remains a subject of heated debate. The Q material consists mainly of sayings of Jesus, but begins with some sayings of John the Baptist. For the most part narratives are missing; most conspicuously of all is the Passion Narrative.
The critical text edition will include an introduction; the running text of Q; new translations of Q in English, German, and French; the fully formatted Greek text of Q with parallels in Matthew, Luke, Mark, Gospel of Thomas, and other gospels wherever relevant; a concordance; and a bibliography.
Reflecting the work of more than forty scholars in the International Q Project, this book is a cooperative venture between Fortress Press and Peeters Publishers (Leuven, Belgium). This also is the first volume of Hermeneia Supplements. [via]