Two resources, overlapping users
1A neighborhood reading room offered both a printed map and an audio guide. The coordinator wrote in a brief report, 'Not all visitors used the audio guide.' A new volunteer read this as meaning that nobody had used it. The coordinator explained that the sentence alone did not support that conclusion.
2The detailed notes recorded visitors who used the audio guide and visitors who relied on the printed map instead. The notes did not give the size of either group. One visitor used both resources, so audio-guide users and printed-map users could not be treated as categories with no overlap.
3The team revised its summary: some visitors used the audio guide, but others did not. It did not claim that most visitors preferred either resource. To decide which resource to expand, the team would need more information about use and preference. A statement that rejects universal use is not a measurement of a majority or a report of preference.