HILT is a terminology service created by JISC that provides machine-readable terminology and mappings between different subject schemes. It aims to improve subject searching and browsing by enriching the terms a user knows through synonyms and related terms. HILT currently covers over 10 subject schemes and will help improve search and browse mechanisms for information services by identifying relevant collections and services based on subject terms. HILT is beginning a six month public testing period and invites individuals and services to participate.