This is a situational question which the interviewer is using to explore your capabilities and supporting Information & Communication Technology. They're interested in your answer, but they're also trying to learn more about your project management skills. Your answer should cover the project, your role, any challenges you overcame, and the results. Hopefully, you have researched the organization and have some understanding of their technology. If so, your answer should align with either project they've recently completed or ones they may be considering.

"One of the projects I am most proud of involved converting a company's telecommunications system from a PBX to VoIP. When planning and executing this project, I had to overcome several challenges, including resistance from the employees to have to learn a new technology as well as some technical issues which made the conversion difficult. However, I engaged each of the department heads in the planning process, soliciting their input and getting their buy in to the transition based on the business benefits the company would realize. My team and I completed the project one week ahead of schedule and on budget. The training we provided the company's users made for a smooth transition to the new system. Within three months, we realized the cost savings we had projected, and the company's productivity increased due to the technical features the VoIP system offered. Even the user resistance diminished over time."