What type of testing is this?

I am an agile product owner for an engineering/sales tools application, and I'm looking for suggestions on what to name a particular type of testing. Due to the complexity of our application and the need to identify bugs as soon as possible, we have a 2 week time slot for user testing while the integration with other applications is occurring.

Since integration is not complete and this isn't end-to-end testing, so I'm assuming this cannot be called user acceptance testing. Users will be expected to validate calculations, test functionality, provide performance feedback, etc. Would you consider this "Black Box Testing" or simply "User Testing?"