Can someone provide details about airlines dividing crew into personality groups?
I spoke to my friend at the one of the ME3 carriers. She tried to find any information regarding this matter but was not able to find it. However during your recruitment process you have to perform a personality test and based on this test you are placed in one of the total of 7 groups. During the scheduling they combine people from different groups so that there is a balanced and workable crew on board. Say that you're in group 5, then you will for example mostly work with people that are in group 1 and 3.
Questions on this personality test are like:  


Would you rather (example: clean a room or work within a group)
Which statements best describes you? (leader, selfish, friendly, etc, etc)


These airlines are run on performance optimization and care less about human values.