There were made a lot of design systems in the last few years. In most cases, these systems are just a set of colors, typo rules and components, that are so tightly fixed. The connection of elements between the components is often weak, and the system consistency vanishes. It becomes inflexible and prevents future evolution of interfaces. We took a different look and made Whitepaper. It's open-source tools for building declarative design systems based on BEM principles.