The goal of the initial version of this glossary was utility for a particular purpose: to serve as an aid for Peace Corps volunteers working as laboratory technicians in Morocco. The lexical selection was based on a specific and limited corpus: instructions for a series of laboratory tests prepared by the Ecole des Techniciens de Laboratoire Chimie-Biologique (School for Laboratory Technicians in Biological Chemistry) of the Institut National dHygine (National Health Institute) of Morocco.