What is scalability testing? This is another software testing question that asks you about a less common definition for a type of testing. Fortunately, there is nothing particularly difficult about answering this question.

Scalability testing is simply testing how well an application will scale. Usually, this means increasing the number of users, but it might also mean increasing any other volume that the application has to handle, such as data volume or the number of supported transactions.

In case the application does not scale according to requirements, scalability tests help identify the bottlenecks that are holding the application back in scale.

Scalability testing is therefore a special kind of performance testing, and is closely related to load testing.

In summary, scalability testing is testing an application to see how well it will scale under greater loads, and identifying the bottlenecks that might prevent successful scaling.

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