consider an estimation problem in which a random sample is be taken form a distribution involving a parameter 0. Suppose that for every sufficiently large sample size n, that is, for every value of n greater than some given minimum number, there exists a unique M.L.E. of 0. Then,under certain condition , which are typically satisfied in practical problem, the sequence of M.L.E.'s is a consistent sequence of estimators of 0. In other words, in most problems the sequence of M.L.E.'s converges in probability to the unknown value of 0 as n