Acceptance Testing - Beta Testing

The BETA test is usually performed by a select subset of actual customers outside the company, before the software is made available to all customers. In a beta test, people who represent your market use the product in the same way(s) that they bought the finished version and give your comments.

Prudent beta testers will not rely on your product because you will warn them that this unfinished version may still have horrible bugs. Since they're not working full time with your product, they will not test it as thoroughly or as quickly as you would like.