A second set says that only a few choices are the way to so as not to confuse the customer. Assuming that the optimal design is one in which the customer browses for a desired video the fastest, use a keystroke level model type analysis to determine which of the following designs is better. Twenty search categories are on the first screen. The titles are in alphabetical order. The store owns approximately 1000 titles in each category so that a customer would need to view 21 screens to see all the titles in a given category.
Some titles are in more than one category.
On average, a customer will search 7 title screens before he or she finds a title of interest. They will also skip searching 3 screens on average. That is, they will see 10 screens, searching 7 of them and skipping 3. Ten search categories are on the first screen. These categories are broken into approximately ten sub-categories on any of the next screens that are reached from the first screen.