This is a report of a project designed to identify important non-technical words used in the teaching of science at Form 3 and 4 level in the Territory of Papua and New Guinea (T.P.N.G.). After the words were identified, multiple choice items testing the comprehension of these words were written, tried out and revised. Fifteen final tests, each containing 40 items, were produced and administered to a stratified random sample of pupils. A panel of Victorian (Australia) teachers and science education researchers participated in the compilation of the word list and construction of the items. This original word list was not substantially changed by the T.P.N.G. panel. The tests (after some minor modifications in the wording of some items) were administered to a sample of Victorian secondary science pupils drawn from schools participating in the Australian Science Education Project materials trials. Contained in this report are an alphabetic word list, the percentages correct for each items at the various form levels, a word list organized on the basis of levels of difficulty, and a complete alphabetic listing of all the items used, together with their associated distractor popularities. (PEB)