# Next teaching D-first-3

## Whole source

Original next revision record: First clue: “Look at the piece.” Revised clue: “Find the oval front panel.” Source: a pretend radio drawing with a rectangular body and oval front panel. No reader response is recorded.

## Invitation

Explain the useful change and a question still to check.

## Three complete moves

Keep both complete versions visible and identify the actual changed detail.

Ask an optional understanding question as a plan; record a real answer only if a willing reader actually tries it.

Cover the model. Reread the whole new source in the usual route, invite a fresh small contribution, and preserve the exact own words and actual help.

## Staff possible reasoning

The revision names the panel and its shape; whether this reader finds it remains open.

## Notice

A revision reason and its untested outcome remain separate.

Original different teaching source; not performed teaching or learner evidence

Record actual teaching and help before a later offer. Model exposure is not erased by covering the model.