A part of Drstivāda (12,h Anga (principal canonical work)),
by the study of which, the capacity to understand the Sūtra (1) (canonical text) etc. is attained.
sūtrādigrahaṇayogyatāsampādanasamarthaṃ parikarma.(Sthā 4.131 Vṛ Pa 188)
See - Dṛṣṭivāda.