In the section entitled "Concerning the Service of the Church," the Book of Common Prayer identifies the normative services of the Episcopal Church:
The Holy Eucharist, the principal act of Christian worship on the Lord's Day and other major Feasts, and Daily Morning and Evening Prayer, as set forth in this book, are the regular services appointed for public worship in the Church. (BCP, 13)
Eucharistic propers (collects, Scripture readings, and proper prefaces) are provided in the Book of Common Prayer for the days when the Eucharist is the principal service. As celebration of the Eucharist has become more frequent, many congregations and other communities of faith now celebrate weekday Eucharists on days for which the Prayer Book does not assign propers.
To facilitate the use of these authorized options, this resource contains weekday propers for the seasons of the Church Year (the temporal cycle), the Common of Saints (the sanctoral cycle), and Various Occasions from the Prayer Book and from resources authorized since the adoption of the Prayer Book. The propers in this resource are grouped into three sections by type for the temporal cycle, the sanctoral cycle, and various occasions.