Abstract: It has important significance to assign a bug report to the most suitable developer to repair in large software projects.At present,there are some methods using in automatic distribution for bug reports,such as utilizing description information of the historical bug reports,associating of bug reports,and historical information of bug report assignment.However,these methods do not fully exploit the information of defect report.This paper proposed to combine historical repair information with history assignment information.Firstly,a tossing graph is built up based on historical information of bug report assignment.Secondly,the similarity of new bug reports and historical bug reports is calculated,and the K final solvers who are corresponding to the K bug reports which have the highest similarity to the new bug report are selected.Finally,according to the dependent relations of these solvers in the tossing graph,a prediction assignment path is generated.To verify the validity of this method,we performed experiments with Eclipse and Mozilla defect report set.Experiments show that the method we proposed is superior to other methods in the accuracy of prediction.

Key words: Historical bug report,Defect similarity,Tossing graph,Predicted assignment path