Yes and no. For examples: I went to the Railroad Museum intending to photograph reactions of small children to Tommy Tankcar. I found pealing paint, and returned another day for a whole series. I went to Starved Rock with the general notion of photographing rock formations, but few pre-conceived ideas. I went to Horicon marsh with notion of photographing geese flying out of the fog; found wonderful spider webs instead. Returned next year to shoot spiders. None to be found. Planning is good, but try to keep flexible.