Developing times have been drifting shorter for some time, favorite techniques such as water bath and divided development do not work as they once did. "Conventional wisdom" if such a thing exists would hold that emulsion "thickness" has much to do with it. I have learned in my readings and here that it is most likely more complex than that but what does effect which developing agents work best and why would the old techniques no longer work or how would one design an emulsion that would respond to them?