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The Greek word ευχολόγιον 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 Ευχολόγιον το Μέγα 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 are also a variety of more concise editions, that contain only the most commonly done of these services.  These texts are often called the '''Small Euchologion''' (''mikron euchologion''), and usually contains the forms for the mysteries ([[sacraments]]) other than the [[Eucharist]] and [[ordination]], and other common services.

The Small Book of Needs is excerpted from the Great Book of Needs for the purpose of convenience, in order to have a small book for the performance of needs, especially those needs which must be served outside the temple.

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.

The ''Ieresky Molitvoslov'' contains some services that are considered Trebnik services, however, this is more of a devotional book for priests than a service book for public services.

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''.  This collection of the Trebnik services attempts to organize these services in a more logical sequence than the Slavonic Trebnik has been historically published in.

Volume One contains the services associated with the 7 sacraments.

Volume Two contains services for the sanctification of Ecclesiastical items, [[icon]]s, crosses, etc; and services associated with the [[liturgical year]].

Volume Three contains prayers for various needs, general blessings, and services connected with [[death]], [[funeral]]s, [[burial]]s, and commemorations of the departed.

Volume Four contains [[Molieben|Moliebens]], services of supplication, and other services of blessing.

Br. [[Isaac Lambertsen]] has also done a translation of the entire Slavonic Trebnik, as well as services that are unique to the Greek Euchologion, but due to the publication of the Book of Needs by St. Tikhon, the publication of his translation has been put on hold indefinitely.