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This collection of Discourses, Anguttara Nikaya, containing 9557 short suttas, is divided into eleven divisions known as nipatas. Each nipata is divided again into groups called vaggas, which usually contain ten suttas. The discourses are arranged in progressive numerical order, each nipata containing suttas with items of Dhamma, beginning with one item and moving up by units of one until there are eleven items of Dhamma in each sutta of the last nipata. Hence the name Anguttara meaning "increasing by one item." The first nipata, Ekaka Nipata, provides in each sutta single items of Dhamma called the Ones; the second nipata, Duka Nipata, contains in each sutta two items of Dhamma called the Twos; the last nipata, Ekadasaka Nipata, is made of suttas with eleven items of Dhamma in each, called the Elevens.
Anguttara Nikaya constitutes an important source book of Buddhist psychology and ethics, which provides an enumerated summary of all the essential features concerning the theory and practice of the Dhamma (see U Ko Lay's, Essence of Tipitaka for more information). Also, see Numerical Discourses of the Buddha, an anthology of suttas taken from the Anguttara Nikaya, translated and edited by Nyanaponika Thera and Bhikkhu Bodhi.