What is Scalability Testing

Definition

A test designed to prove that both the functionality and the performance of a system will scale up to meet specified requirements.

Comment

Generally, load and stress tests should continue to the point where the system fails and its scalability is proven.

Measurements should be taken during the load and stress testing activities to ensure that the most information possible is available to make a decision on the scalability of the system. The more information that is available, the less risk there is of an unexpected event happening in the future that could turn out to be costly