Since the 1960s there is a controversial discussion about the correct explication of the concept of knowledge in epistemology, but until today no generally accepted solution to the problem of defining this concept has been found. This book contributes to the discussion in epistemology by proposing a new explication of the concept of knowledge which is spelled out in terms of coherence. The main thesis of this book is that a belief can be considered knowledge only if first, it is true and second, it coheres with the rest of the beliefs of the person holding the belief in an appropriate manner. The explication draws on the ideas of Donald Davidson, Laurence BonJour and Keith Lehrer and offers a new perspective on the old project of analyzing the concept of knowledge.