From the very beginning of the interview, your interviewer is giving you information, either directly or indirectly. If you are not hearing it, you are missing a major opportunity. Good communication skills include listening and letting the person know you heard what was said. Observe your interviewer, and match that style and pace.
Don't Talk Too Much
Telling the interviewer more than he needs to know could be a fatal mistake. When you have not prepared ahead of time, you may ramble when answering interview questions, sometimes talking yourself right out of the job. Prepare for the interview by reading through the job posting, matching your skills with the position's requirements and relating only that information.
Don't Be Too Familiar
The interview is a professional meeting to talk business. This is not about making a new friend. Your level of familiarity should mimic the interviewer's demeanor. It is important to bring energy and enthusiasm to the interview and to ask questions, but do not overstep your place as a candidate looking for a job.
Use Appropriate Language
It's a given that you should use professional language during the interview. Be aware of any inappropriate slang words or references to age, race, religion, politics or sexual orientation -- these topics could send you out the door very quickly.
Don't Be Cocky
Attitude plays a key role in your interview success. There is a fine balance between confidence, professionalism and modesty. Even if you're putting on a performance to demonstrate your ability, overconfidence is as bad, if not worse, as being too reserved.
Take Care to Answer the Questions
When interviewers ask for an example of a time when you did something, they are asking behavioral interview questions, which are designed to elicit a sample of your past