Give definitive answers and specific results. Whenever you make a claim of your accomplishments, it will be more believable and better remembered if you cite specific examples and support for your claims. Tell the interviewer something about business situations where you actually used this skill and elaborate on the outcome. Employers want to know what mistakes you have made and what is wrong with you. Relate stories or examples that heighten your past experience.
Past performance is the best indicator of future performance.
If you were successful at one company, odds are you can succeed at another. Be ready to sell your own features and benefits in the interview. Know everything about your potential employer before the interview. Customize your answers as much as possible in terms of the needs of the employer. This requires that you complete research, before the interview, about the company, its customers, and the work you anticipate doing.