One city, one season, one observer, forty minutes a place. What that rules out, what it still permits, and why it was published. A transparent field pilot can test team activity context for field operations against the real administrative effort required to collect, correct and review the record.
The three claims this record will stand behind, each in the narrowest form the figures permit, with what would break it. For independent context on inclusive places and field research, review material from Disability Rights UK.