Tools change at different speeds. One application may gain features while another remains deliberately simple. A clear interface gives them a shared agreement without requiring their internal designs to stay alike.

Keep the agreement focused on the information and behavior that both sides need. Explain valid inputs, expected outputs, and the meaning of an error. Changes are easier to manage when the original expectations remain discoverable.

Consider how an older participant would recognize a new possibility. Explicit versions or optional fields can help in some situations, but the right approach depends on the interface. The lasting value is a boundary that people can understand and verify.

Imagine a practical setting.

Consider a document export with a few clearly defined fields. A modest agreement can remain easier to preserve than a sprawling collection of incidental details.

Before the next experiment.

A visible improvement needs a useful comparison. Describe the earlier condition and the task that should become easier, then look for the actual change.
A few starting points
  1. Describe the shared expectations.
  2. Keep the agreement focused.
  3. Plan how participants recognize a change.

Follow a related question

Identify the smallest displayed step.

Resolution is not the whole measurement

Give each text level a role.

A type scale with a job

Keep learning

Related background to continue exploring this subject.

W3C: web standards IETF: the standards process
Explore a possibility