An interview by a print journalist, like a broadcast interview, is a conversation with an aim. However, whereas in a broadcast interview the audience are listeners or viewers who ‘eavesdrop’,  in a print interview they are readers.  In other words, the journalist is more of a filter in a print interview: you are relying entirely on what he or she writes. You can’t hope to convince readers if you haven’t convinced the journalist, and so the aim of this conversation is to do just that – to convince the journalist.
You and the journalist are both there to do a job.  His/hers is to get information; yours is to give it.  The journalist wants you to perform as much as you do.  The only difference is that your agenda may differ from his/hers. You need to use the subject of the questions to make the points you want to make.
The trick is to steer the interview down a middle path, so that the journalist’s questions are answered and your own objectives are achieved.  If you don’t manage this, only one of you is likely to leave happy – maybe neither of you!
Luke Roberts, Founder Spokesperson Media Training