 The frame and qualification problems . AI researchers ( like John McCarthy ) who used logic discovered that they could not represent ordinary deductions that involved planning or default reasoning without making changes to the structure of logic itself . They developed new logics ( like non @-@ monotonic logics and modal logics ) to try to solve the problems . 
 The frame and qualification problems . AI researchers ( like John McCarthy ) <a href='null_relcl' title='1'><mark>who</mark></a>used logic discovered that they could not represent ordinary deductions <a href='null_relcl' title='2'><mark>that</mark></a>involved planning or default reasoning without making changes to the structure of logic itself . They developed new logics ( like non @-@ monotonic logics and modal logics ) to try to solve the problems . 
Da frame and qualification problems . AI researchers ( like John McCarthy ) used logic discovered that they could not represent ordinary deductions involved plannin or default reasoning w/o making changes to tdastructure of logic itself . They developed new logics ( like non @-@ monotonic logics and modal logics ) to try to solve thdaroblems .