# A reviewed progress component

Extend the level component with a clearly specified operation of your own. Submit both successful and expected-failure evidence plus a reviewable explanation.

- Record the allowed inputs and promised result.
- Keep assertion checking enabled and record compiler settings.
- Test low and high valid inputs and one precondition violation separately.
- Demonstrate that a deliberately wrong body is caught, then restore it.
- Explain a remaining limitation and identify one next learning step.