This paper explains the indifference zone and subset selection methods of selecting populations. We recommend them as preferable to pairwise multiple comparisons for selecting the best genetic material in tree breeding, especially when a large number of groups with small differences must be tested. Subset selection permits the data to determine the number of groups designated as including the best genetic material with preassigned probability. Numerical examples of selection procedures are given. For. Sci. 35(2):425-436.