A new sampling method to estimate the required number of samples to be takenis presented in this paper based on the improved m-m model of Iwao proposed byXu et al.(1984).The equation for estimating the number of samples required(Q)is:where int: statistic quantity. D. permitted percentage of error, presented as a decimal, a'. the mean crowding for the distribution of the number of individuals per basic component. β'. the relative degree of aggregation in the distribution of the basic components at low popula...