Priority of any defect relates directly to the business impact of the software application While severity is the measure of level of impact that a bug can have on the application. Priority defines the sequence in which we are supposed to correct the defect.Most of the people assume that a highly critical or severe bug have the most priority. It may not be always true that a highly severe change is always prior and vice versa. Every thing depends on the time and business impact. The biggest example I may take is of the client logo. Its the most easy thing but if its coming wrong it means it will have high priority even if the severity is low.
We can further classify severity into following type :
Critical: This type of defect may lead to system crash or may cause loss of data or may create unsatisfaction to end user . There is no alternative for this type of severity .
Major: The defect that results in the termination of the complete system or one or more component of the system and causes extensive corruption of the data. The failed function is unusable but there exists an acceptable alternative method to achieve the required results then the severity will be stated as major.
Moderate: The defect that does not result in the termination, but causes the system to produce incorrect, incomplete or inconsistent results then the severity will be stated as moderate.
Minor: The defect that does not result in the termination and does not damage the usability of the system and the desired results can be easily obtained by working around the defects then the severity is stated as minor.
Cosmetic: The defect that is related to the enhancement of the system where the changes are related to the look and field of the application then the severity is stated as cosmetic.
Priority can be of following types:
Low: This type of defect has the least priority and this can also be deferred.
Medium: The defect should be resolved in the normal course of development activities. It can wait until a new build or version is created.
High: The defect must be resolved as soon as possible because the defect is affecting the application or the product severely. The system cannot be used until the repair has been done.Its done on urgent basis. The turnaround time of such defects are lowest.
Who assigns it :
Priority and severity can be given while logging defect depending on the time and impact. usually the priority and severity is assigned by someone who has the application and business knowledge.
We can further classify severity into following type :
Critical: This type of defect may lead to system crash or may cause loss of data or may create unsatisfaction to end user . There is no alternative for this type of severity .
Major: The defect that results in the termination of the complete system or one or more component of the system and causes extensive corruption of the data. The failed function is unusable but there exists an acceptable alternative method to achieve the required results then the severity will be stated as major.
Moderate: The defect that does not result in the termination, but causes the system to produce incorrect, incomplete or inconsistent results then the severity will be stated as moderate.
Minor: The defect that does not result in the termination and does not damage the usability of the system and the desired results can be easily obtained by working around the defects then the severity is stated as minor.
Cosmetic: The defect that is related to the enhancement of the system where the changes are related to the look and field of the application then the severity is stated as cosmetic.
Priority can be of following types:
Low: This type of defect has the least priority and this can also be deferred.
Medium: The defect should be resolved in the normal course of development activities. It can wait until a new build or version is created.
High: The defect must be resolved as soon as possible because the defect is affecting the application or the product severely. The system cannot be used until the repair has been done.Its done on urgent basis. The turnaround time of such defects are lowest.
Who assigns it :
Priority and severity can be given while logging defect depending on the time and impact. usually the priority and severity is assigned by someone who has the application and business knowledge.
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