Once you submit your application to business school, the admissions committee will conduct a preliminary screening based upon your undergraduate GPA and CAT/MAT/XAT/Etc. scores. If you meet a pre-determined "academic cutoff," you will likely be invited for a personal interview to further probe your suitability for that particular business school.
The personal interview is a critical step in the admissions process and should not be taken lightly; most MBA programs will not accept a candidate without meeting him/her in person. A personal interview is aimed at knowing a candidate more intimately - assessing the clarity of thinking process, future goals and the 'fit' with the B-school. It provides the admission committee of a b-school to evaluate your interpersonal and soft skills.
Personal Interview can also turn out to be an opportunity to 'sell' yourself. While intimidating for some MBA-hopefuls, the personal interview represents a prime opportunity. Interview allows you the chance not only to put a face and personality to the name and credentials on your application file, but also to express your academic, personal, and professional accomplishments, experiences, and intentions.
The focus of a B-school interview can range from specific questions about your job to broad discussions on life. Approach the interview as a conversation to be enjoyed, not as a question-and-answer ordeal. It may be about your hobbies - your recent cross-country trip. This doesn't mean that the interviewers are not serious. It just means that you're being sized up as a person and a future professional in all your dimensions.
On the other hand, the PI is an opportunity for the b-school to question you about your application, your autobiographical sketch or any issues on your transcripts or entrance test scores. Your interviewer wants to learn what you are like as a person and how well you respond and communicate. We want to understand your values, how you think and how well you handle yourself under pressure.
One and all b-school is committed to admit students who are able to handle the rigors of business school on an academic, personal, physical and psychological basis. Your interview is your opportunity to convince the admission committee that you are up to the challenge you are expected to face in future.