First three eigenvalues for each groups were given in Table 1. Ratios of first eigenvalues to the second ones indicated that unidimensionality assumption was satisfied for mathematics subtest and for each groups. Local independence means that after conditioning on ability, examinees’ responses to the items on the test are likely to be independent (Hambleton et al, 1991). In general, when the unidimensionality is met, assumption of local independence is said to be met. On the other hand, even assumption of unidimensionality is met, local independence can not be satisfied (Lord, 1980).