Methods of obtaining knowledge

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Knowledge may originate or be derived from the following origins or methods:

Observation or experience. This may be more or less sophisticated, ranging from a simple, "I saw" to carefully designed controlled experimentation.
Reason or logic. Taking other knowledge as data, by logical operations knowledge can be inferred. For example the theoretical construct, the electron, is derived by logical inferences from observations and experiment. Such knowledge, being derivative, can not be better than the knowledge upon which it is founded.
- Modelling a situation sometimes allows those with a hands-on viewpoint to learn how-to do something. This pragmatic approach is often seen in computer programming.
Testimony. Knowledge based on the acceptance of testimony involves accepting what others say. For example, I only know that Kent is a county of England, that the First World War was horrendous and that David Beckham earns $30 million per year because I have learned these things from other people. This seems to be a common way we get knowledge but is seen by philosophers as problematic. See Testimony, philosophical problems of.
- Authority. Knowledge based on authority may rely upon the reputation of an individual such as Aristotle or Einstein or perhaps on institutional authority such as that of the Roman Catholic Church or Oxford University. Note that an authority may adopt knowledge upon other criteria such as divine revelation or observation as well as upon authority. Authority may have a political basis in the sense that some political process, perhaps involving status as well as simple voting, peer review, or comment. This is familiar to participants in academia.
Revelation. Many people believe knowledge may be obtained via revelation or even divine revelation, which may be directly from God or another spirit, perhaps conveyed through a religious text or texts, such as the Bible.