Apastamba Srauta Sutra (Praśna-s 1–24): Instructions for Vedic sacrifices.
Paribhāṣā, Pravara, and Hautraka (Praśna 25): General rules, ancestral lineage details and prayers.
Āpastamba Gṛhya Sūtra (Praśna-s 26–27): Focus on domestic rituals and rites of passage.
Āpastamba Dharma Sūtra (Praśna-s 28–29): Outlines law, ethics and the duties of different social classes.
Āpastamba Śulba Sūtra (Praśna 30): Mathematical and geometric principles required to construct sacrificial altars.