maxim makatchev maximpittedu abductive theorem proving analyzing student explanations guide feedback intelligent tutoring systems makatchev p w jordan k vanlehn lrdc university pittsburgh journal automated reasoning special issue automated reasoning theorem proving education vol 32 issue 3 pp 187226 2004 abstract why2atlas tutoring system presents students qualitative physics questions encourages explain answers natural language although inexpensive techniques analyzing explanations claim better understanding necessary use within tutoring systems paper motivate describe system creates uses deeper proofbased representation student essays order provide students substantive feedback explanations describe detail abductive reasoner tacituslite use within tutoring system also discuss evaluation results early version why2atlas system subsequent evaluation theoremproving module conclude discussion work progress additional future work deriving benefits proofbased approach tutoring applications kluwer site httpwwwkluweronlinecomissn01687433contents draft also available httpandes3lrdcpittedu7emaximpapersartepdf tue 05 aug 2008 185955 0800 uai paper announcement abductive theorem proving analyzing student explanations