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NOT.5:3 - Forces
| Force | What must be reconciled |
|---|
| Receiving operation and source detail | A simpler target can make one operation easier while removing distinctions needed by another. |
| Meaning and expression form | The same consequence can survive different layouts or spellings; some work also needs those forms retained. |
| Recovery and retained information | Keeping extra source information enables a return but adds storage, access and maintenance work. |
| Forward translation and backward change | A forward rule can determine the view without determining which source update the user intended. |
| Composition and accumulated loss | A locally usable conversion can remove information that a later conversion needs. |