The completion stage (Tibetan:dzok-rim, (Wyl: rdzogs rim); Sanskrit:saṃpanna-krama) is one of the two stages of Anuttarayoga Tantra and Anuyoga. Completion stage may also be translated as perfection stage or fulfillment mode. The generation stage (Tibetan:kye rim; Sanskrit:utpatti-krama) generally precedes the completion stage.
Completion stage practices are associated with working with lung and the body.
The Dharma Dictionary defines the 'Completion Stage' as follows:
One of the two aspects of Vajrayana Practice. The meaning and depth of this principle changes while ascending through the three outer sections and the three inner sections of Tantra. For instance, the completion stage defined as the dissolving of the visualization of a deity corresponds to Mahayoga; the "Completion stage with marks" based on yogic practices such as tummo corresponds to Anu Yoga: and the "Completion stage without marks" is the practice of Ati Yoga.
The completion stage engages creative imagination or visualization and emphasizes the voidness aspect of reality as a skillful means of personal transformation. The completion stage employs the "mystic vortices" of the body, the cakra, the subtle energy of the subtle body, the five pranas or vāyu, together with the channels, the nadi through which the energy flows in order to generate the 'great bliss' (Tibetan: Dem Chog or bde-mchog; Sanskrit: Maha-sukha) associated with bodhi or enlightenment.
Keith Dowman, in elucidating the spiritual disciplines of the Mahasiddhas, links the completion stage with the Two Truths, voidness, along with a suite of advanced Mahamudra sadhana and other practices that are related to the Six Yogas of Naropa such as tummo: