This collection of papers assesses the validity of the MLAT. It is not self-evident that a test designed for English speaking university students in America and validated there is necessarily valid in an English university. The differences between American English and British English are evident, and American universities admit a greater proportion of the population than do English ones and different entry qualifications apply. It is also possible that different educational methods lead to the strengthening of different aptitudes. The collection consists of three main sections: (1) Descriptions of the experiment and discussion of the MLAT with particular reference to its internal and predictive validity. A multiple regression analysis is used for this. (Culhane). (2) A description of the performance of a select group of students of "proved" linguistic ability, including error analysis of the sub-tests and a description of learning strategies for Part V. (Lee) (3) Detailed item analysis of sub-tests III and IV to determine which were the relevant factors operating in a speeded and a non-speeded sub-test. There is also a limited assessment of the validity of Part V in relation to a memory-based course in Scientific Russian. (Shepherd and Alford). (CHK)