The second edition of this book has cleaner and more readable print and larger pages than the 1978 edition and is 130 pages longer. Techniques that have been added include the Ansari- Bradky test, Lehmann contrasts techniques for comparing all treatments and a control, an aligned-ranks procedure for the Friedman test, the Lilliefors test for normality. and several measures of association for qualitative data. Sampling for the Wilcoxon signed ranks, Mann—Whitney, Kruskal-Wallis and Friedman tests also have been derived, and references have been updated. Other changes are minor.