[4] The findings from several studies using this methodology consistently showed that shared beliefs were a stronger predictor of liking than simply belonging to the same group.
[12] Studies found that in situations where stronger measures of attraction are considered, category (e.g. ethnic, race, group) differences become more significant than beliefs.
[15][16][17][18] According to Milton Rokeach's personal communication in 1981, his intent was to advocate the strong version of the theory, that belief systems are the only factors that need to be considered when analysing prejudice and discrimination.
Conversely, the "weak" version suggests that belief congruence accounts for a larger portion of discrimination variance than do perceived physical differences.
[17] While belief congruence plays a crucial role in contexts free from strong social pressures, its influence does not negate the impact of racial or ethnic differences.
[11][14] It's also important to note that as the impact of race diminishes, the distinction between the strong and weak versions of the theory becomes progressively less relevant for immediate practical purposes.