This study examined the proposition derived from the integrative developmental contextual theory (IDCT) (Bar-Tal & Teichman, 2005; Teichman & Bar-Tal, in press) that contextual circumstances determining collective self esteem (i.e. conflict and social status), and developmental stage in which identity development is a central issue (pre- and early adolescence) would influence intergroup biases. This proposition was previously examined with Israeli Jewish participants and here is re-examined in three samples, aged 8-17, including Israeli Arabs and two groups from the Palestinian Authority. The three samples were based in different intergroup contexts in which their group status was relatively high, medium or low. The findings demonstrate differences in the relationship between contextually defined collective self-esteem and intergroup attitudes. Results confirmed the hypothesis that in conflict, irrespective of age highest intergroup biases would be displayed by the high status group. However, the hypothesis that the lowest status group would express only more negativity toward the out-group was not confirmed. The developmental hypothesis that pre- and early adolescents from the high status group would express most varied and extreme biases was also confirmed. With some exceptions in the middle status group, all older adolescents displayed moderation in biases. (Contains 2 figures, 1 table and 1 footnote.)