On Ignorance and Contradiction Considered as Truth-Values

A critical view of the alleged significance of Belnap four-valuedlogic for reasoning under inconsistent and incomplete informationis provided. The difficulty lies in the confusion between truth-valuesand information states, when reasoning about Boolean propositions.So our critique is along the lines of previous debates on therelevance of many-valued logics and especially of the extensionof the Boolean truth-tables to more than two values as a toolfor reasoning about uncertainty. The critique also questionsthe significance of partial logic. Received for publication 8 November 2007.