And I agree with Gareth about the decisive moment fallacy. Even HCB's contact sheets were not full of one-shot wonders.
Maybe a bit of a deviation, but here is a good quote from an old photonet discussion:
The book "On verra bien" (ISBN 91-973787-6-3) is a commemorative over the work of Swedish master photographer Christer Strömholm (1918-2002). In an interview (p168) Strömholm says the folloving:
"My first encounter with Cartier-Bresson [in the early fifties] was quite strange. I had found out where his agency was and asked if I could come by and show some pictures. So I made four prints (which was quite difficult in Paris, I seem to remember that I got help at United Press), of what I felt were bloody good Paris pictures. He looked at them for three seconds - or maybe half a second in fact, very quickly anyway, and then said: 'May I see your contact prints?'.
- Contact prints!, I said, more or less as if I always..., I haven't got them with me, but I can bring them tomorrow... convinced that he would say no, that won't work. - Good!, he said. I'd like to see your contact prints. Are your pictures all on the same roll? - No, they must be on two or three rolls, came my reply.
- Bring them round tomorrow!
- Well, now...! What the hell did the old codger want with my contact prints? I couldn't understand it. Was it to annoy me, I mean can you see anything on contact prints? And yes, in the end I managed to go up to United Press again and make those contact prints after having spent half the night ruining a bunch of paper, and I returned to Cartier... . He put on his glasses and pushed them up on his brow, examined each frame carefully, and we're not talking two seconds now, it was more like three bloody minutes per sheet... And then he began to point: 'How did you do this, what was your thinking, why do you choose to photograph from this point, have you noticed the light, why aren't you on the other side, why aren't you faster here?' That was when I began to realize how important contact prints are, how much can be read from them. That was why, later on, we were so careful about contact prints at Fotoskolan [Academic photo school founded by Strömholm] ."