The Greek word
ευχολογιον literally means "book of prayers." The Slavonic word ''Trebnik'' literally means "book of needs." This type of service book varies widely in contents and arrangements. The most comprehensive edition is the ευχολογιον το μεγα or '''Great Euchologion''' contains the prayers of the [[priest]], [[deacon]], and [[reader]] for [[Vespers]], [[Orthros]], and the Divine Liturgy; the six remaining sacraments, and other services of blessings (which in the west are often referred to as ''sacramentals'').
The Slavonic Great Book of Needs consists of two parts:
# The sacraments and other sacred rites, which accompany a man from birth and counsels him at his departure into eternity.
# Short prayers for various needs. There is also a calendar and the "Alphabetic Classification of Names," the latter being a list of Christian names.
There is also a Supplemental Book of Needs in Slavonic, which contains within services such as the orders for the consecration of a temple and the consecration of things pertaining to the temple, such as the [[liturgical objects|church utensils]], [[vestments]], [[icons]], and so forth. This Supplemental Book of Needs is often combined into one book with the Small Book of Needs.
What distinguishes the services found in the Euchologion is that they are generally services that are not appointed to be done at any given time according to the Church calendar, but are done as the need arises (e. g. , funerals, weddings, baptisms, the consecration of a new church , etc .). Some services are associated with the liturgical calendar , however, such as the blessing of candles on the Feast of the [[ Presentation]], the blessing of Palms on [[ Palm Sunday]], etc.
In English, there are various editions of the Small Euchologion, but only one (4 volume) edition of the entire Euchologion, [http://www.stspress.com/Searchresult.aspx?CategoryID=4 published by St. Tikhon's Seminary Press] under the title ''The Great Book of Needs''.
== Source ==
*[http://www.anastasis.org.uk/eucholog.htm Portions of the Euchologion]
*[http://www.saintjonah.org/services/library.htm Practical Tips on how to Build a Liturgical Library]