The six-branch (plus bookmobile) Rangeview Library District, Adams County, CO, will be the first library system in the country to fully drop the Dewey Decimal Classification in favor of a system adapted from that used in the book industry. While Dewey has been dropped in some smaller branches, Rangeview’s biggest building will have 85,000 items.
Here's how they describe breaking up with Dewey
As part of Rangeview Library District’s “Customers First” philosophy, the district is replacing the 133-year-old Dewey Decimal Classification with its own WordThink system. This new method was generated from a retail-based standard for organizing materials. Similar to what you might see in a bookstore, materials are arranged by simple categories like history and science instead of the old numeric system. Customers are delighted at the ease of use of this new system, which is geared more towards browsing and helps customers find exactly what they need quickly and intuitively.
WordThink is based on BISAC, the book industry's cataloging system for bookstores; it has fewer subdivisions than Dewey, and uses words instead of numbers to classify. So instead of the book having a number 649.1 ELL on the spine, it simply has PARENT, and all of the parenting books get shelved together alphabetically and not sub-sub-divided by decimal point. BISAC itself uses this coding
but it appears that WordThink dispenses with the numeric code as well.