Abstract. I introduce the notion of knowledge relativity as a proposed conceptual link between different scientific disciplines. Examples from Informatics and Philosophy, particularly Newell's knowledge level hypothesis and Popper's world 3 of knowledge, are used to demonstrate the motivation for making this notion explicit. 1 Why Knowledge Relativity? Not every assumption is knowledge and whether somebody's personal views on the world are classified as knowledge is determined by complicated interactions among human subjects and between human subjects and their environment. The word science itself means knowledge and thus one would assume that the distinction between arbitrary unilateral assumptions on the one hand and shared mutually assured knowledge on the other hand is uncontested in contemporary science. But one scientific discipline has adopted a notion of knowledge that abandons the distinction between knowledge itself on the one hand and the mode of it's exp...