Two subsystems meet at an
interface. Define it: what
crosses, in what units and
format, timing, error
behaviour, and who owns each
side of every assumption.

Define the Interface Precisely

Ownership of each assumption, which is what interfaces are for.

Prompt

Two subsystems — [describe them] — meet at an interface. Write the interface definition: what crosses it, in what units and format, timing, error behaviour, and who owns each side of every assumption.