The idea for HLS was born in 1990 under the auspices of the Swiss Academy of Sciences. A coalition of historians, linguists, and archivists secured federal funding to create a national reference work that would catalog Swiss history, geography, and culture. Early meetings focused on how to classify entries—deciding whether to sort by chronology, region, or thematic clusters—an essential step for a coherent term architecture.
By 1998, the project shifted from a printed compendium to an online platform, reflecting the rise of the internet in academic publishing. A dedicated editorial board designed a hierarchical taxonomy: primary categories (e.g., “Political Institutions”), sub‑categories (e.g., “Cantonal Governments”), and cross‑references linking related concepts. Multimedia elements—maps, photographs, and audio—were integrated, establishing the modern, searchable structure that defines HLS today.