How would you answer an interview scenario involving forms and controlled inputs in React?

For an interview scenario involving forms and controlled inputs, I would first clarify the business goal, scale, constraints, and the failure or quality attribute the interviewer wants to explore. A controlled input receives its current value from React state and reports changes through an event handler so React remains the source of truth. In this scenario, for a registration form that must disable Submit until fields are valid, store the field values, derive validation state, and submit a normalized payload only when validation succeeds. For production, use controlled inputs for interactive validation and dependent fields. For complex forms, centralize form state or use a form library while keeping validation rules clear. I would then explain the main alternatives and tradeoffs, identify likely failure modes, and describe how I would validate the solution through testing, observability, security controls, and recovery or rollback planning.