Carroll diagram Carroll diagram A Carroll diagram, Lewis Carroll's square, biliteral diagram or a "two-way table" is a diagram used for grouping things in a yes/no fashion. Numbers or objects are either categorised as 'x' (having an attribute x) or 'not x' (not having an attribute 'x'). They are named after Lewis Carroll, the pseudonym of Charles Lutwidge Dodgson. Although Carroll diagrams can be as simple as the first one above, the most well known types are those similar to the second one, where two attributes are shown. The <nowiki>'</nowiki>universe<nowiki>'</nowiki> of a Carroll diagram is contained within the boxes in the diagram,
Mark Dodgson (1730-1795). Mark Dodgson Mark Dodgson (born 1 May 1957) is an Australian academic and author. His research on the innovation process has influenced innovation management and policy worldwide. Born in Norwich, UK, he grew up in Wales and Uganda, where his father was pilot to Presidents Milton Obote and Idi Amin. He is the brother of author, Philip Pullman. After a number of years working as a lorry driver and drayman in London, Dodgson completed his PhD in two years at Imperial College London and worked at the Science Policy Research Unit at University of Sussex for eight years. During