Defect is the variance from a desired product attribute (it can be a wrong,missing or extra data). It can be of two types – Defect from the product or a variance from customer/user expectations. It is a flaw in the software system and has no impact until it affects the user/customer and operational system.

What are the defect categories?
With the knowledge of testing so far gained, you can now be able to categorize the defects you have found. Defects can be categorized into different types basing on the core issues they address. Some defects address security or database issues while others may refer to functionality or UI issues.

Security Defects: Application security defects generally...

Before we discuss that what are good Defect Tracking process first of all we'll discuss what exactly is a defect itself. If we are to understand, in a nutshell, that what a Defect is then we'll come to know that a defect in a software is usually a term that defines the concept of a failure to conform to specifications of the software package. For example, an incorrect implementation of specification and missing of the specific requirements(s) from the software.
Now after understanding briefly what Software Defects are, we're moving on to our next important topic that is a Good defect tracking process.
Software Quality Assurance engineers work together as a team in departments to effectively...

Software testing defect metrics is used to measure the quantification of a software related to its development resources and/or development process. It is usually responsible for quantifying factors like schedule, work effort, product size, project status and quality performance. Such metrics is used to estimate that how much of more future work is needed to improve the software quality before delivering it to the end-user.
This process of testing defect metrics are used to analyze the major causes of defects and in which phase most of the defects are introduced. Below we are going to discuss some key software testing defect metrics:

Defect Density:
The defect density is measured by adding...

One of the challenges all software development organizations face is how to handle the defect-tracking (also known as "bug" tracking) process. Unfortunately, often, little thought is put into designing and implementing such a system. Among the reasons that a well-designed defect-tracking system is necessary:

• Traceability – You need to know what areas of the system produce the most defects.
• Accountability – Do you have weaker developers and/or QA engineers? For
example: a developer who writes sloppy code will cause more defects, and a QA engineer who lacks attention to detail may miss a critical bug during the testing process.

Testing is an Art while determining the severity of a defect found in a system. The classification of impact of Defect is important for following reasons: