There are many different ways to approach questions about you past work experience during an interview. One strategy, according to the Michigan Civil Service Commission, is to use the STAR technique. Whenever possible, you will want to frame your responses to such interview questions using the STAR response method.
S = Situation
T = Task
A = Action
R = Results
The steps involved are to describe a SITUATION / TASK encountered, to identify the ACTIONS taken to address the SITUATION or TASK, and to discuss the RESULTS achieved by the ACTIONS.