Two documents can describe the same thing differently—or disagree while sounding almost identical. Before using a comparison, check each conclusion against passages from both files. A list of highlighted changes is a starting point, not a decision about which source is right.
This is a tool-neutral manual exercise, not a Sophon feature walkthrough. The two cards and expected answers below are manually written fiction, not real PDFs, OCR output, AI answers or a performed product test. You need no upload or subscription to practice.
1. Fix the files and scope
For real work, use documents you are authorized to read and preserve the originals. Record each filename, revision, reviewed section and page range. Distinguish the viewer page number from the printed page label; add a heading so another reader can find the passage.
Decide whether you are comparing versions or independently authored notes. A newer-looking filename does not establish authority. Unreadable or unreviewed pages remain unchecked.
2. Compare meaning, not matching words
Read the two practice cards below before checking the answer matrix. Compare exactly their complete three-line scopes. Write one conclusion per topic, retaining the passage and locator from each source.
Check units, dates, negatives and conditions. Here, sixty minutes and one hour are equivalent. That does not mean any two quantities with different units are interchangeable: establish the conversion and context before calling them equal.
Keep conflicting statements side by side. Do not choose the later-looking note or turn two conflicting deadlines into a date range. Ask the source owner to resolve the disagreement before relying on a deadline.
Manually written fictional exercise
These are independent notes about the same fictional workshop, not established old/new versions. There are no underlying PDFs, screenshots, OCR runs, AI answers or product tests. Page locators are invented for this exercise.
Card A — Cedar workshop notes A, revision 1
Practice locator: viewer page 2, printed page 1, "Introductory workshop"
1. Briefing lasts 60 minutes.
2. Bring a notebook.
3. Registration closes Monday.Card B — Cedar workshop notes B, revision 1
Practice locator: viewer page 4, printed page 2, "Introductory workshop"
1. Briefing lasts 1 hour.
2. Registration closes Tuesday.
3. Materials are provided only to registered attendees.Manual expected answer matrix—not a performed test
In the table, A and B refer to the complete card identities and invented locators above. These are the entire reviewed scopes, not selections from real PDFs.
| Topic | A passage | B passage | Expected conclusion |
|---|---|---|---|
| Duration | Line 1: 60 minutes | Line 1: 1 hour | Same meaning here: 60 minutes = 1 hour. |
| Registration | Line 3: Monday | Line 2: Tuesday | Unresolved conflict. Retain both locators and ask the source owner; choose neither and do not combine them into a range. |
| Notebook | Line 2: Bring a notebook. | Not stated in reviewed B card | Stated only in reviewed A scope; not evidence of a revoked requirement or absence elsewhere. |
| Materials | Not stated in reviewed A card | Line 3: provided only to registered attendees | Stated only in reviewed B scope, with that condition intact; neither universal availability nor prohibition by A follows. |
3. Bound what you did not find
Use “stated only in reviewed A scope,” not “missing from B,” unless your review supports that broader claim. Failed search is not proof of absence. If text recognition, reading order or legibility is uncertain, consult the scanned-text checking guide and mark the affected comparison unable to verify.
Adobe documents text-only comparison and page-range settings. Those controls belong to Acrobat; they do not establish equivalent Sophon features. The official documentation was captured October 14, 2026, Shanghai time; no app was tested for this guide.
4. Keep a reusable record
Use the record below for each topic. Keep unresolved questions visible in any summary you share. Agreement between chatbots, or a citation without checking its passage, does not verify a conclusion. Source support also does not prove real-world truth.
If either input or the reviewed scope changes, recheck the affected conclusions. Before sharing, another reader should be able to reopen both sources, locate your passages and understand precisely what remains uncertain.
Reusable review record
Topic and compared scope:
A filename/revision:
A viewer page / printed label / heading / supporting passage:
B filename/revision:
B viewer page / printed label / heading / supporting passage:
Relationship: same meaning / conflict /
stated only in reviewed A or B scope / unable to verify
Checked conditions and units:
Review result and unresolved question:
Reviewer and date:
Recheck when either input or reviewed scope changes.For an unlocated passage, record the scope searched and the limitation; do not invent a source locator. A review record is not a correction to either source file.