The Sarma tradition of new translation schools, recognizes four classes of tantra (Wyl. rgyud sde bzhi):

Three outer classes of tantra | Three outer classes—

• Kriya Tantra,
• Charya Tantra and
• Yoga Tantra;

And one inner class of tantra, which is called

• Highest Yoga Tantra.

The latter is divided into three:

• Father Tantras, such as the Guhyasamaja Tantra, the King of Tantras;
• Mother Tantras, such as the Chakrasamvara Tantra; and
• Non-dual Tantras, such as Kalachakra.<ref>The Kalachakra Tantra can be designated either as a Mother Tantra or Non-dual Tantra. See Kalachakra Tantra, Rite of Initiation by the Dalai Lama and Jeffrey Hopkins (London: Wisdom, 1985), pages 165-6.</ref>

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