Recently, the makers of Diet Coke made major product and packaging changes--there are new flavors and a slimmer, taller can.  (If you're not familiar with the product, Google "Diet Coke new packaging" to get a sense of what they've done.)  What information did Diet Coke need before and during the development process? What sort of research do you think they conducted before making such a change? What research should they be doing now to assess the success of the change?