I am a fairly junior programmer and have the task of interviewing an experienced mainframe COBOL programmer for a position doing C++ development for Windows Mobile. By experienced I mean that the candidate's entire programming career has been COBOL.
I am not biased against any particular language, just slightly concerned about my ability to do a thorough interview.
Inside of an interview how can I, with no COBOL experience, get a good feel for the abilities of this interviewee?
Are there any specific things I should ask or look for?
I have already read up on a lot of general interview stuff on SO, what would be helpful are any specific things I look for given the nature of the candidate's background.