Roger, many of the really great photographers that worked on the street have written about the esthetic approach that they take and there is a method to how they work and many stated it in their own words. Davidson, Meyerowitz, Evans, Bresson, Boogie, Lyon, all worked like this and they all wrote about it.
"That’s not how "great ones" work though. They work on subject, on idea, on theme."-MIkhail They produced the bodies of work and they wrote about it thats how we know. They told us and more important is they actually put those bodies of work together and they are all out there for us to see. Davidsons East 100th Street, Subway, Time of Change, Bressons Mexican Notebook, Danny Lyon The Bikeriders, Robert Frank, The Americans and most of the well known photographers that worked on the street worked as MIkhail stated.