The actual format of an interview may vary, but most have similar components.

Arrival:

At least 5-10 minutes before interview time (no more than 15 minutes).

Greetings:

Firm handshake, eye contact, repeat the interviewer's name.

Introduction:

Ice breaking time within first 5 minutes of greeting.

Background Analysis:

10 minutes of questions about you. 5-10 minutes of your questions about their organization. After doing your research, you should have ready the attention-grabbing questions which will demonstrate your analytical ability, preparation, and incredible insightfulness before you ever step in their office.

Closing:

Usually indicated by the interviewer when asking for any last questions. Be confident in last impression, ask what the next step is or when you will hear a decision, get interviewer's card, give firm hand shake with eye contact, and say, "thank you!"

Follow Up:

Send a typed thank you letter within 24 hours of interview (only 20% of job applicants follow-up: this will say a lot about your professionalism!).