Scholarly response to Holocaust denial can be roughly divided into three categories. Some academics refuse to engage Holocaust deniers or their arguments at all, on grounds that doing so lends them unwarranted legitimacy. The second group of scholars, typified by the American historian Deborah Lipstadt, have tried to raise awareness of the methods and motivations of Holocaust denial without legitimizing the deniers themselves. "We need not waste time or effort answering the deniers' contentions," Lipstadt wrote. "It would be never-ending... Their commitment is to an ideology and their 'findings' are shaped to support it." A third group, typified by the Nizkor Project, responds to arguments and claims made by Holocaust denial groups by pointing out inaccuracies and errors in their evidence.