What is the term for testing conducted by users at the developer's site?

The term for testing conducted by users at the developer's site is alpha testing. This type of testing is typically carried out by a small group of internal users or testers, often before the software is released to a larger audience. The primary focus of alpha testing is to identify bugs and issues through real-world usage scenarios while the product is still in its developmental stage.

This early stage of testing helps developers understand how the software behaves in a user environment and allows them to make necessary adjustments and improvements before moving on to broader testing phases, such as beta testing or release to customers.

Beta testing differs from alpha testing because it takes place in a real-world environment with actual users outside the development organization, allowing for broader feedback and validation of the product. Acceptance testing is typically conducted to determine if the system meets the agreed requirements and is often the final step before production release. Regression testing is a different concept altogether, focusing on verifying that previously developed and tested software still performs after a change has been made, such as a bug fix or new feature addition.