'becoming', 'process of existence', consists of 3 planes:
The whole process of existence may be divided into two aspects:
(1) Karma-process (kamma-bhava), i.e. the karmically active side of existence, being the cause of rebirth and consisting in wholesome and unwholesome volitional actions. See Karma, paticca-samuppāda (IX).
(2) Karma-produced rebirth, or regenerating process (uppattibhava), i.e. the karmically passive side of existence consisting in the arising and developing of the karma-produced and therefore morally neutral mental and bodily phenomena of existence. Cf. Tab. - (App.).