A unique situation is encountered in determining the durability of fabrics under field test situations; i.e., the data can be analyzed at any point in time in the test. This sug gests that the sensitivity of the test can be determined at any point by utilizing the well- known concept of the power of the analysis of variance test. With this information, a decision can be made to stop or continue the test as in the usual sequential procedures. The results of the application of this method to an actual test is presented.
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