Why Filter UI Design Fails—and How CNF/DNF Fixes It

As applications demand more sophisticated querying, developers face an inherent tension between creating simple, user-friendly interfaces and preserving logical expressiveness. The author reveals how conventional approaches—from raw text input to flat toggles to tree-like builders—inevitably sacrifice either usability or functionality. By structuring filter logic around formal concepts like CNF and DNF, developers can design interfaces that remain intuitive for non-technical users while enabling them to express arbitrarily complex nested conditions.