Eighteen chief kinds of insight-knowledge (or principal insights, mahā-vipassanā) are listed and described in Vis.M. XXII, 113: (1) contemplation of impermanence (aniccānupassanā), (2) of suffering (dukkhānupassanā), (3) of no self (anattānupnupassanā), (4) of aversion (nibbidānupassanā). (5) of detachment (virāgānupassanā), (6) of extinction (nirodhānupassanā), (7) of abandoning (paṭinissaggānupassanāā), (8) of waning (khayānupassanā), (9) of vanishing (vayānupassanā), (10) of change (vipariṇāmānupassanā), (11) of the unconditioned (or signless, animittānupassanā), (12) of desirelessness (apaṇihitānupassanā),
(13) of emptiness (suññatāupassanā), (14) insight into phenomena which is higher wisdom (adhipaññā-dhamma-vipassanā), (15) knowledge and vision according to reality (yathā-bhūta-ñāṇadassana), (16) contemplation of misery (or danger, ādīnavānupassanā), (17) reflecting contemplation (paṭisaṅkhānupassanā), (18) contemplation of turning away (vivaṭṭanānupassanā).