Be prepared!  As obvious as it might seem, it remains a very common mistake for candidates to not adequately prepare for an interview.  Here are some of the most important things you should know and do:

• Know what the company does.  Where they are in the marketplace? Look for press releases to refer to in the interview.  Knowing a lot about the company will “always” impress your interviewer.
• Know what position the person interviewing you holds.   Are they the manager for the position, the HR Manager, a recruiter?
• Have a job description and be prepared to correlate your experience to the job description of the position.  Ask questions about the position outside of what is in the job description.  What is the work environment, will you work with a team or as an individual?

If you do your homework it will dramatically increase your chances for success!  Don't forget to close out your interview by letting the interviewer know you want the job!  Ask for it !  Simply say something such as:  “I believe that I am an excellent fit for this position; when can I start?”