Workfront currently provides two types of testing environments for users to review and see how features work using their own data on a separate sandbox server. The two environments are the Preview Sandbox and the Custom Refresh Sandbox. We have also provided an Early Access environment in the past, which allowed users to review new features in their Production environment. Starting in December 2016, the Early Access environment has been deprecated and no new functionality has been released to it. It is still currently available to access from your Production environment.