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Sosa, Williamson, and Pritchard - to name three prominent epistemologists - have all endorsed safety in one way or another, and many others have followed them. Safety for Sosa requires truth in all close-by possible worlds in which the belief is held on the same basis.[7] For Pritchard, safety is a necessary condition of knowledge. There are differences between the formulations provided by Sosa, Pritchard and Williamson. Contrast this view with Pritchard's who says that 'I am sympathetic to the idea that there is a way of thinking about the sensitivity principle such that it is equivalent to the safety principle (Pritchard [29], fn 18)'. 28 Pritchard, Duncan " Safety-Based Epistemology: Whither Now?. [Extracted from the article]