Say you're working on a website that uses an icon system. Lots of people who work on the site interact with the icon system. Designers create new icons, they tweak existing ones, they have ideas on what they want the icons to do. Developers building out the pages of the site use the system.
Say you're the front-end developer. You're implementing this system. You're the middle man. You're the creator and consumer of this system.
What do you ask of the designers?