National governments increasingly recognize the importance of legal recognition and documentation of customary rights. With hundreds of millions of unregistered land claims globally, rapid and robust approaches are needed to document and administer communal and household rights in the long-term. USAID’s Tenure and Global Climate Change (TGCC) Program piloted customary land documentation processes in Zambia that relied on local knowledge and the use of low cost mobile applications to secure tenure (MAST).