Experimental Setup The baseline method we consider is the one in (<cite>Barzilay and McKeown, 2001</cite> ) without sentence alignment -as the bug reports are usually of one sentence long. From the figure we can see that our holistic approach using global-context score to rank and co-occurrence score to filter (i.e., Rk-S g +Ft-S c ) has higher precision than the <cite>baseline approach</cite> (i.e., <cite>BL</cite>) in all ks.