The Compendium of Caraka 1.30.30

1.30.30

atha bhiṣagādita egva bhiṣajā praṣṭavyo 'aṣtāvidhaṃ bhavati tantraṃ tantrārthān sthānām sthānārthān adhyāyam adhyāyārthān praśnaṃ praśnārthāśceti pṛṣṭena caitadvaktavyamaśeṣeṇa vākyaśo vākyārthaśo 'arthāvayāvaśaśceti& //

Now, right from the beginning a physician should be questioned by a physician in eight ways: the treatise, the meanings of the treatise, the sections, the meanings of the sections, the chapter, the meanings of the chapters, the question, and the meanings of the questions. And when asked, he should explain this completely, sentence by sentence, sentence-meaning by sentence-meaning, and component by component of the meaning.