About the Lectionary ...
A Lectionary is a table of readings from Scripture appointed to be read at public worship. The association of particular texts with specific days began in the 4th century. The Lectionary [1969, revised 1981] developed by the Roman Catholic Church after Vatican II provided for a three-year cycle of Sunday readings. This Roman lectionary provided the basis for lectionary in The Book of Common Prayer 1979 as well as those developed by many other denominations.
The Common Lectionary, published in 1983, was an ecumenical project of several American and Canadian denominations, developed out of a concern for the unity of the Church and a desire for a common experience of Scripture. It was intended as a harmonization of the many different denominational approaches to the three-year lectionary. It has been in trial use in the Episcopal Church and among the member denominations since 1983.
The Revised Common Lectionary, published in 1992, takes into account constructive criticism of the Common Lectionary based on the evaluation of its trial use.
The Revised Common Lectionary is a three-year cycle of Sunday eucharistic readings in which Matthew, Mark and Luke are read in successive years with some material from John read in each year.
Transition to the Revised Common Lectionary at Advent 2007
The 75th General Convention in June, 2006 directed that the Revised Common Lectionary replace the Book of Common Prayer lectionary "effective the First Sunday of Advent 2007; with the provision for continued use of the previous Lectionary for purposes of orderly transition, with the permission of the ecclesiastical authority, until the First Sunday of Advent 2010 (A077)." (Episcopal News Service)