The collection of discourses in the Sutta Pitaka known as Samyutta Nikaya has 7,762 suttas of varied length, generally short, arranged in a special order according to subject matter into five major divisions.
This first division or book, the Sagatha vagga, contains eleven samyuttas with discourses grouped according to characters appearing in them, the king of devas, the devas, the Brahma, Mara, King of Kosala, bhikkhus and bhikkhunis. The word Sagatha is derived from the fact that various personalities appearing in the discourses conducted their dialogues or interviews with the Buddha mostly in verse.
This second division or book, the Nidana vagga, is a collection of suttas primarily pertaining to causation or the principles of conditionality and interdependence, explained in the detailed formula of 'Paticcasamuppada', or Dependent Origination. Various aspects of Paticcasamuppada, together with expositions on doctrinal matters concerning practice of the holy life form the main theme of these samyuttas.
The third division or book, the Khandha vagga, is a collection of suttas primarily pertaining to the five aggregates: matter, sensation, perception, mental concomitants and consciousness. Made up of thirteen samyuttas, the Khandha Vagga forms an important collection of doctrinal discussion on such topics as atta, anatta, eternity, and annihilation.
The fourth division or book, the Salayatana-vagga, is a collection of suttas primarily pertaining to the six senses: eye, ear, nose, tongue, body and mind. Concise but illuminating expositions on Nibbana are found in many suttas.
The fifth division or book, the Mahavagga, or great section, is made up of twelve samyuttas, that deal the Noble Eightfold Path (magga), the Seven Factors of Enlightenment (bojjhanga), the Four Establishment of Mindfulness (satipatthana), the Faculties (indriya), the Four Right Striving (sammappadhana), the Five Powers (bala), the Four Bases for Spiritual Power (iddhipada), Anuruddha discourses, the Jhanas, Mindfulness of Breathing (anapana), Factors of Stream-entry (sotapatti) and the Truths (sacca).