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Is knowledge justified true belief? The knowledge being talked about in the question is propositional knowledge.

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Introduction

Is knowledge justified true belief? The knowledge being talked about in the question is propositional knowledge. An example of prepositional knowledge is; "my name is Bert" justified true belief, is a proposition that someone feels is correct and for which they have a cogent argument for believing so and which is in fact true. But is knowledge equivalent to justified true belief? For knowledge to be equivalent to justified true belief, it follows that justified true belief is necessary and sufficient for knowledge. Belief is necessary for knowledge, since without belief you would be unable to maintain that you knew a certain proposition. For example you may say that you know that you are holding a pen in your hand but unless you believed you were holding a pen in your hand you couldn't know that. ...read more.

Middle

For example a psychic who predicts that a card picked from a pack will be a six of hearts, even though he has got the card right for the last 100 times cannot be said to know the card will be a six of hearts until it is picked from the pack. So all three are necessary for knowledge an example would be "I know it is raining since water is falling from the clouds above my head". The only question left is; are these three criteria sufficient? It would seem that they are, however it is possible to think of situations where a true belief can be based on a falsehood. ...read more.

Conclusion

So it would seem that a fourth condition is necessary for knowledge. Reliabalists believe that only beliefs that are justified by a reliable method can constitute knowledge. The problem with this is that 'reliable' is a very vague term for example a reliable car may break down once a year however if an aeroplane broke down once a year it would be unreliable. They also maintain that beliefs that are based on false beliefs are not formed by a reliable method. However there can be reliable methods for gaining true beliefs that are based on falsehoods for example the Aztecs believed that if they sacrificed people to their gods the sun would come up again the next day and when they did so the sun did indeed come up. ...read more.

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