The controversial recent Stanford study finding that organically grown food is no more nutritious than conventionally grown food is an interesting example of resource description and classification and how the resulting interactions in an organizing system come together to form conclusions. The study was a meta-analysis of previously published studies of conventional and organic food.
Whether or not readers recognize it as such, they all use some kind of personal organizing system to determine which books they choose to read (in other words, to add a given resource to the collection of books that will be read). The very vastness of the collection of available books makes it essential to do so. Along with metadata such as genre, author, price, and library availability, a common method of developing organizing principles for this system is to use description resources (recommendations from friends, editorial reviews, online user reviews).