Nyaya

• Gautam
• Tarkshastra,
• Theory of Pramana; 

Pratyaksha

• Nirvikalpa - indeterminate
• Savikalpa - determinate
• Laukik
• Bahyapratyaksha
• Manopratyaksha
• Alaukik
• Jyanalakshanam
• Samanyalakshanam
• Yogaj

Anumana
Vyapti

• Invariable, unconditional, Universal relation of concomitance
• Sama
• Asam

Hetvabhasa

Upamana

Shabda

• Agam & authoritative verbal T
• Vaidika - perfect, invariable , spoken by G , V
• Secular - apta-purush , trustworthy person
• Akansha -mutual expectancy of word
• Yogyata - w convey meaning
• Sannidhi - proximity of W
• Tatparya - speaker intention