You are testing a significant enhancement to the user interface design for a mortgage approval program, used internally by mortgage lenders. There are many user roles involved in the process of…

You are testing a significant enhancement to the user interface design for a mortgage approval program, used internally by mortgage lenders. There are many user roles involved in the process of reviewing and approving new mortgage applications. You have completed the testing that ensures the enhancements are functionally correct and you must now ensure that the enhanced user interface meets the needs of all user roles in a way that will be considered acceptable by them. Which test technique would be MOST suitable for this next stage of testing?