Once use cases have been identified, text can be written describing how the user and system will interact.

I know your systems can interact much more swiftly than the time it would take to speak those words aloud in front of me.

Each side was having trouble understanding the other's notion of how the product's mechanical and electronics systems would interact.

Evolution takes place in the background as the system is interacting with its environment.

Among other things, the Odums explored how one natural system can interact with another.

However, any real physical system is not absolutely isolated, and will interact with its environment.

These two systems interact to determine our goals, thoughts, and behavior.

However, it is unknown how these two systems interact when both types of information are available.

"This may help us understand how the immune system and brain interact," he said.

The realization that these three systems can interact, and the identification of the mechanisms involved, has only come within the past few years.