It is interesting to note that the advances in test methods which are generally sought have remained constant over many years-quicker tests, cheaper tests, more reproducible tests, better design data and tests which are more relevant to service performance. Almost by definition this includes because a more fundamental test is not likely to be also quicker and cheaper. It also explains why there is never one direction in the development of test methods and apparatus. The perceived deficiencies in the existing methods are seen differently according to the particular purpose under consideration and hence development effort is targeted appropriately