There is a big problem!!! The 1st page of the workbook instructs you to LISTEN to expressions and then answer workbook questions. The problem is that audio tapes/CDs are nowhere to be found!!! This entire Integrated Korean series is completely useless without those tapes. It's really too bad because the text is thourogh and clear. The workbook is a nice accomplice. I reluctantly have no choice but to return my text and workbook.