Dynamic epistemic logic is the logic of the effects of epistemic actions like making public announcements, passing private messages, revealing secrets, telling lies. This paper takes its starting point from the version of dynamic epistemic logic of , and demonstrates a tool that can be used for showing what goes on during a series of epistemic updates: the dynamic epistemic modeling tool DEMO . DEMO allows modeling epistemic updates, graphical display of update results, graphical display of action models, formula evaluation in epistemic models, and translation of dynamic epistemic formulas to PDL  formulas. DEMO is written in Haskell. This paper intends to demonstrate its usefulness for visualizing the model transformations that take place during epistemic updating.
|Title of host publication||Proceedings 6th Symposium on Trends in Functional Programming (TFP'05, Tallinn, Estonia, September 23-24, 2005)|
|Editors||M. Eekelen, van|
|Place of Publication||Tallinn|
|Publisher||Institute of Cybernetics|
|Publication status||Published - 2005|