The answer should follow SAR pattern:

S = Situation
A = Action
R = Result

For ex. sample situation:
Our depatment was getting a many complaints from customers on too many email notifications.

I did a research and found out that the problem was that each department handled notifications in they own ways. Our group took the responsibility and developed unified cross-company email notification system.

The system allowed to reduce amount of emails to our clients by combining and sending email according to notification priority.

Answers and Comments

Agile project management

100 Common Interview Questions, audio book