Where Bugs Come From? Invalidity of communication Imperfect definition of requirement analysis Deviation of requirement Logistical mistake of design Not obey the rule with document and code ●Procedure error ●Code mistake ●Document mistake 同濟大学 TONGJI UNIVERSITY Software testing/Qinpei Zhao 2023/12/16 9 Software testing/ Qinpei Zhao 2023/12/16 • Invalidity of communication • Imperfect definition of requirement analysis • Deviation of requirement • Logistical mistake of design • Not obey the rule with document and code • Procedure error •Code mistake • Document mistake Where Bugs Come From? 9