Definitions, rules and laws, by which scientific functionality and the realm of its applicability is determined, clearly prove philosophy's impact. The aim of this book is to clarify these connections to philosophy, showing philosophy's relevance in various disciplines, which are constitutive to information and computation sciences (IS/CS), and hence and finally to its application within information technology, exposing its relevance even to the practitioner. The dialogue includes dealing with the concept of computation and information. The action theory addresses the non-representational aspects of information and knowledge. Analysing the analogy of both structures, people can explain the specific relevance of the individual constituents of the justified true belief conception for action. Concepts of implicit and explicit knowledge was anticipated in the early 1990s when Hagen Gruber introduced the design principles of formal ontologies. A philosophy which inspires practitioners is also a motivation for philosophers, and practitioners will listen to philosophers more openly if they realize that philosophy gives them valuable insights.