ABSTRACT Aim The primary aim of the exchange was to examine the agreement obtained by using constant-rate-of-loading procedure on 8 in. by 2 in. specimens as tentatively recommended by the International Standardisation Organisation in 1948. Summary The paper deals with the test verdicts, given by eleven laboratories situated in seven countries, on the breaking strength of six kinds of fabric, covering a range from 50 to 500 lb. per in. breaking strength, and consisting of acetate, cotton, nylon, wool and flax fibres. Seven laboratories used the procedure recommended by I.S.O.; two used the secondary I.S.O. procedure of constant-traverse testing, timed to give about one niinute test duration; the remaining two used their ordinary procedure with rapid-traverse pendulum machines. Conclusions The seven sets of verdicts based on the standard procedure had coefficients of variations ranging from one per cent for cotton canvas to nearly three per cent for acetate; the variation, although reasonably good, is appreciably niore than that expected from the fabrics alone. Reported differences and difficulties in gripping specimens are discussed, and point the need for improved definition of the recommended procedure. The two verdicts based on time-controlled constant-traverse rate working are fairly close to the standard results, where gripping was satisfactory on cotton and flax fabrics, but noticeably different on acetate, nylon and wool. The verdicts based on high-speed pendulum machines differ markedly from the others. Note The full report of this work included certain tables in Appendix I and Appendices V–XV, which gave details of the individual tests with relevant observations drawing attention to such things as tests of doubtful validity, jaw breaks etc. Tables II and IV, which contain the summarised results have been extended to include the types of testing machines employed in the various laboratories. Copies of Appendices I and V-XV may be obtained from the Secretary Commonwealth Joint Services Committee, Ministry of Supply, Room 116, Adelphi, London, W.C.2.