Context: Software plays vital role in every day’s life. Historical data shows as evidence that even a minor error in the software can make huge loss in terms of lives and economy. Software quality and reliability has been uncompromising attribute in the software life cycle. The software defect can be defined as ‘small deviation in the process, improper requirement, or misrepresentation of the definition. The defect causes a lateral cost of budget as well as schedule over run. To avoid it, it’s required to forecast software defects in the different phases of the software life cycle. The common approach to denote software quality is ‘to reveal the number of defects present in it’, and it is measured in terms of software defect density. The defect density is measured as a mathematical division of ‘the total number of defects to its size’.