A survey gathering word lists from 40 locations in the Zambales Mountains of the Philippines, for statistical comparison, resulted in the definition of six distinct Negrito languages: Abelen, Magqanchi, Aberlen, Magqindi, Ambala, and Mabeken. With the use of a computer program, WORDSURV, designed for word list comparison, an Ayta language tree was generated based on shared cognate percentages. The language tree identified the locations of each of the six languages and four trade languages (Sambal, Kapangan, Tagalog, and Ilocano). (MSE)