The best way to answer questions about your contributions to the company is to give examples of what you have accomplished in the past, and to relate them to what you can achieve in the future.

Describe specific examples of how effective you have been in your other positions, change you have implemented, and goals you have achieved. Talk about the depth and breadth of related experience that you have.

Also, relate your abilities to the employer's goals. You will want to let the interviewer know that you have the skills necessary to do the job they are hiring for, the ability effectively meet challenges, and the flexibility and diplomacy to work well with other employees and with management.