European Scientific Journal April 2013 edition vol.9, No.12 ISSN: 1857 – 7881 (Print) e - ISSN 1857- 7431 170 DEVELOPMENT AND EVALUATION OF A DEFECT TRACKING MODEL FOR CLASSIFYING THE INSERTED DEFECT DATA Prof.Torky Sultan Ayman E.Khedr Information Systems Department Faculty of computers and Information, Helwan University Cairo, Egypt Mostafa Sayed Information Systems Department Council state Cairo, Egypt Abstract Defect tracking systems play an important role in the software development organizations as they can store historical information about defects. There are many research in defect tracking models and systems to enhance their capabilities to be more specifically tracking. Furthermore, there are different studies in classifying bugs in a step by step method to have clear perception and applicable method in detecting such bugs. This paper shows a new proposed defect tracking model for the purpose of classifying the inserted defects reports in a step by step method for more enhancement of the software quality. Besides, an evaluation of experiment made for measuring the proposed factors results for defects classification. Keywords:Bugs, Defects, Bug Tracking Systems, Defect Tracking Models, Software Quality Introduction In many software development organizations, bug tracking systems play an important role as they allow different types of users communicating with each other (i.e. developers; testers and customers ) to assure that they have the same perception about problems or requesting new features. In addition, bug tracking systems can keep track of more historical information stored of the bugs. Earlier attempts were made for enhancing the defects tracking models and defect classifications (Just, 2008); (KO, 2003); (Curhan, 2005); (Edwards, 2006); (Endres, 1975) and (Janák, 2009). But there were no general farm work for concentrating on