Stay on topic.  Remember that time is something many do not have.  When you get off topic it can cause interviews to take much longer without filling in the blanks the interviewer is looking to fill in.  Most of us have a set of requirements we need to verify a candidate must fulfill.  This is difficult when the candidate strays across topics.

An offer isn’t always a final offer.  Feel free to negotiate during the interview process to get what you want.  Hopefully each position is looked at from a long-term perspective.  Set the foundation early and if the organization isn’t willing to meet your needs then perhaps the position is not a good fit.

Confidence is confidence inspiring.  Be confident in an interview but not cocky.

During your interview make sure to ask questions.  These can be about the job at hand, etc.  But don’t phrase the questions as demands.

If you are interviewing for a job then research the company first.  Know what you can about the history, structure and mission and point out places where there is synergy between you and the company.

Always have a copy of your resume with you.  Some interviewers ask for it just to test you…

Make sure to keep eye contact with whomever you are interviewing with.

If you’re asked technical questions and you don’t know the answer then it’s OK to say that, but follow it up with where you would look for the answer…

Interviewing is never easy.  But it can be a lot harder if you try to take control of the interview.  Let your interviewer drive the agenda.  Let them set the pace for the interview.  And most of all, let them figure out what it is they need to know about you.