Risk Severity: the degree to which a hypothetical event, should it occur, would impact system operation. A risk event is something that has not occurred, so impact must be estimated or extrapolated.
One of the differences between Defects and Risks, is the number of people affected, which can be ascertained during defect triage. You can add the System Function row to a matrix to help align parts of the system with Revenue Impact. That gets subjective, but it helps promote discussion and alignment this table is incomplete and intended only as an illustration :.
Number of People Affected. High Low. It can be useful to have the Severity Level be derived from a set of variables. When you calculate Severity using multiple variables, then you want to use a weighted scale to assign greater weight to Impact on Revenue like that 1, 3, 9 scale AKF recommends. Frequency Persistent Multiple times per day Multiple times per week Multiple times per month Happened once; cannot be reproduced.
Workaround None, or very expensive Complex and totally manual Complex with systems e. The severity of a bug is based on how much it impacts the system. It is categorized on the basis of how much it impacts the functionality of the product.
If the impact is high, i. The priority of a bug, on the other hand, refers to how soon the bug must be fixed. It gives direction on weather the bug should be fixed immediately, or the bug wait until the next release of the system.
A bug can also be High Priority but Low Severity in case if it does not impact the functionality of the system, but should be fixed immediately, such as a mistake in the logo. A bug can also be Low Priority but High Severity in case if the bug has a high impact on the functionality on the system, but the chances of the bug occurring are low, hence the fix can wait until later.
Severity refers to the seriousness of the bug on the functionality of the product. Higher effect on the functionality will lead to assignment of higher severity to the bug. Associated with benchmark quality or adherence to standard. It reflects harshness of a quality expectation. Is largely related to Business or Marketing aspect. It is a pointer towards the importance of the bug. The Quality Assurance Engineer decides the severity level. It is decided as per the risk assessment of the customer.
System crashes that occur with an obscure command is High Severity, as has a high impact on the functionality of the system. Usually, Severity is defined in terms of financial loss, reputation, and loss of life, depending on the application. Severity is categorized in different categories depending on the impact of the defect on the application:. Priority in simple English is used in the comparison of two things and where importance is given to one of them. Similarly, in terms of Defect, Priority is the urgency of the defect to be fixed.
Developers cannot fix so many defects simultaneously, so it is important to prioritize the order of the defects they will fix. Usually, High Severity defects are of High Priority as they demand quick fixing. The priority of defects is categorized as:. The wrong assignment of Priority can cause a delay in resolving a defect that needs prior attention and hence can hamper the product requirements and financial loss.
As a tester, while logging a defect, it is important to drill down and understand the impact of that defect on the end-user, then assign the right Severity and Priority to a defect. This has been a guide to the difference between Severity vs Priority. Here we also discussed the key differences with infographics and through example.
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