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A.6.P.RI:3 - Forces
| Need | Difficulty |
|---|
| Preserve the source meaning | A relative expression can acquire a new referent when copied. |
| Make the result usable by another participant | The recipient may occupy a different position or have different means of action. |
| Keep ordinary language useful | Expanding every pronoun creates work without resolving a live ambiguity. |
| Change an instruction deliberately | Preserving a result and repeating a relative rule are different tasks. |
| Relate experience and observation | The person experiencing a sensation and the person describing it have different access. |