What does usability testing primarily aim to measure?

Usability testing primarily aims to measure user satisfaction and learning ability as it focuses on how effectively users can interact with a system or product. The primary goal is to ensure that users find the interface intuitive, easy to use, and overall satisfactory. This type of testing involves observing users as they complete tasks, gathering feedback on their experiences, and assessing how well they learn to navigate and utilize the features of a product.

In the context of usability testing, user satisfaction is a crucial metric because it reflects the user's perception of the product's usability. Learning ability indicates how quickly and effectively users can understand and use the product without prior training. Thus, usability testing plays a vital role in improving the overall user experience by identifying areas that may cause confusion or frustration.

Other options do not align with the primary focus of usability testing. Speed of execution instead pertains more to performance testing, while automated testing scripts focus on the efficiency and effectiveness of testing processes rather than user experience insights. Code efficiency, while important for development, does not directly relate to how real users interact with and experience the product.