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Pramana i.e., the instrument of Prama is the most fundamental and unique about the tattva shastras. Nyaya darshana deals extensively about the siddhantas of jnana (theory of Knowledge). The means of Prama (valid cognition) is termed Pramana as explained by the Vatsyayana bhashya given below.<blockquote>प्रमाणतोऽर्थप्रतिपत्तौ प्रवृत्तिसामर्थ्थदर्थवत् प्रमाणम् ।... तस्येप्साजिहासाप्रयुक्तस्य समीहा प्रवृत्तिरित्युच्यते । (Vats. Bhas. Intro Before Sutra 1)<ref name=":5" /> </blockquote>Meaning : The effort of the agent (man) stimulated by the desire to acquire (Ipsa । ईप्सा) and the desire to get rid of the thing (जिहासा । Jihasa roga etc) is what is called प्रवृत्तिः (pravrtti । exertion). Two of these together inspire the agent into Prvritti or Action. (Page 20 of Reference <ref name=":6">Mm. Ganganatha Jha. (1939) Gautama's Nyayasutras With Vatsyayana Bhashya. Poona : Oriental Book Agency. ([https://archive.org/details/GautamasNyayasutras/page/n20 Page no 20])</ref>) <blockquote>अर्थस्तु सुखं सुखहेतुः दुखं दुखहेतुश्च । (Vats. Bhas. Intro Before Sutra 1)<ref name=":5" /></blockquote>Summary : The अर्थ (object or thing) cognised by means of Pramana, or the instrument of cognition is of four kinds, viz., Pleasure, Source of Pleasure, Pain, Source of Pain. These objects of cognition, however, are innumerable owing to the fact of the number of living creatures being infinite. (Page 22 of Reference <ref name=":6" />)

Pramana i.e., the instrument of Prama is the most fundamental and unique about the tattva shastras. Nyaya darshana deals extensively about the siddhantas of jnana (theory of Knowledge). The means of Prama (valid cognition) is termed Pramana as explained by the Vatsyayana bhashya given below.<blockquote>प्रमाणतोऽर्थप्रतिपत्तौ प्रवृत्तिसामर्थ्थदर्थवत् प्रमाणम् ।... तस्येप्साजिहासाप्रयुक्तस्य समीहा प्रवृत्तिरित्युच्यते । (Vats. Bhas. Intro Before Sutra 1)<ref name=":5" /> </blockquote>Meaning : The effort of the agent (man) stimulated by the desire to acquire (Ipsa । ईप्सा) and the desire to get rid of the thing (जिहासा । Jihasa roga etc) is what is called प्रवृत्तिः (pravrtti । exertion). Two of these together inspire the agent into Prvritti or Action. (Page 20 of Reference <ref name=":6">Mm. Ganganatha Jha. (1939) Gautama's Nyayasutras With Vatsyayana Bhashya. Poona : Oriental Book Agency. ([https://archive.org/details/GautamasNyayasutras/page/n20 Page no 20])</ref>) <blockquote>अर्थस्तु सुखं सुखहेतुः दुखं दुखहेतुश्च । (Vats. Bhas. Intro Before Sutra 1)<ref name=":5" /></blockquote>Summary : The अर्थ (object or thing) cognised by means of Pramana, or the instrument of cognition is of four kinds, viz., Pleasure, Source of Pleasure, Pain, Source of Pain. These objects of cognition, however, are innumerable owing to the fact of the number of living creatures being infinite. (Page 22 of Reference <ref name=":6" />)

According to another scholar Pramana is defined as प्रकृष्टरूपेण अनुमाति (Page 12 of Reference <ref name=":1" />)<blockquote>''"To know an object correctly is a kind of proper measurement of an object. 'knowing' is metaphorically called 'measuring' through our cognition. As a valid cognition gives us a picture of a particular object, it may be described as 'intellectual measurement'."''</blockquote>

According to another scholar Pramana is defined as प्रकृष्टरूपेण अनुमाति अनेन (Page 12 of Reference <ref name=":1" />)<blockquote>''"To know an object correctly is a kind of proper measurement of an object. 'knowing' is metaphorically called 'measuring' through our cognition. As a valid cognition gives us a picture of a particular object, it may be described as 'intellectual measurement'."''</blockquote>

==== Pramana and Pramanabhasa ====

==== Pramana and Pramanabhasa ====

The second instrument of valid knowledge is Anumana Pramana.  

The second instrument of valid knowledge is Anumana Pramana.  

According to Nyaya sutras <blockquote>अथ तत्पूर्वकं त्रिविधं अनुमानं पूर्ववत्शेषवत्सामान्यतोदृष्टं च ।।५।। {अनुमानलक्षणम्} (Nyay. Sutr. 1.1.5)<ref name=":4" /></blockquote>Meaning : After perception comes Inference which is led up to by perception; it is of three kinds - Purvavat (पूर्ववत्), Sheshavat (शेषवत्), and Samanyatodrshtam (सामान्यतोदृष्टम्).

According to Nyaya sutras <blockquote>अथ तत्पूर्वकं त्रिविधं अनुमानं पूर्ववत् शेषवत् सामान्यतोदृष्टं च ।।५।। {अनुमानलक्षणम्} (Nyay. Sutr. 1.1.5)<ref name=":4" /></blockquote>Meaning : After perception comes Inference which is led up to by perception; it is of three kinds - Purvavat (पूर्ववत्), Sheshavat (शेषवत्), and Samanyatodrshtam (सामान्यतोदृष्टम्).

The meaning of the above sutra is explained by Vatsyayana bhashya as follows <blockquote>तत्पूर्वकमित्यनेन लिङ्गलिङ्गिनोः संबन्धगर्शनं लिङ्गदर्शनमं चाभिसंबध्यते । लिङ्गलिङ्गिनोः संबध्द्योर्दर्शनेन लिङ्गस्मृतिरभिसंबध्यते । स्मृत्या लिङ्गदर्शनेन चाऽप्रत्यक्षः अर्थः अनुमीयते । (Vats. Bhas. Nyay. Sutr. 1.1.5) (Page 65 of Reference <ref name=":5" />)</blockquote>Meaning : The expression तत्पूर्वकम् meaning 'led up to perception' refers to the relation between the Linga (लिङ्ग । mark) and the Lingi (लिङ्गि । object indicated by the mark) and also between pratyaksha and linga itself. The perception of the relation between linga (mark) and lingi  (object) also implies Smrti (स्मृतिः । remembrance) of linga.  Thus by means of Smrti and darshana of Linga (mark) the Apratyaksha (अप्रत्यक्षः । non-perceptible) object (अर्थः) is inferred (अनुमानम् । anumana).  

The meaning of the above sutra is explained by Vatsyayana bhashya as follows <blockquote>तत्पूर्वकमित्यनेन लिङ्गलिङ्गिनोः संबन्धदर्शनं लिङ्गदर्शनमं चाभिसंबध्यते । लिङ्गलिङ्गिनोः संबध्द्योर्दर्शनेन लिङ्गस्मृतिरभिसंबध्यते । स्मृत्या लिङ्गदर्शनेन चाऽप्रत्यक्षः अर्थः अनुमीयते । (Vats. Bhas. Nyay. Sutr. 1.1.5) (Page 65 of Reference <ref name=":5" />)</blockquote>Meaning : The expression तत्पूर्वकम् meaning 'led up to perception' refers to the relation between the Linga (लिङ्ग । mark) and the Lingi (लिङ्गि । object indicated by the mark) and also between pratyaksha and linga itself. The perception of the relation between linga (mark) and lingi  (object) also implies Smrti (स्मृतिः । remembrance) of linga.  Thus by means of Smrti and darshana of Linga (mark) the Apratyaksha (अप्रत्यक्षः । non-perceptible) object (अर्थः) is inferred (अनुमानम् । anumana).  

Thus anumana depends totally on previous experiences through pratyaksha and this knowledge follows other kinds of knowledge. Example : where there is smoke there is fire.   

Thus anumana depends totally on previous experiences through pratyaksha and this knowledge follows other kinds of knowledge. Example : where there is smoke there is fire.