These include differences in perception and problems with motor skills, sleep, and emotions.

These factors include health, wealth, biological differences, and education.

Reasons for the variability include sampling error and differences in the wording or order of questions.

Their friction went beyond personalities and power politics to include ideological differences.

Its unique structure includes regional differences under one umbrella.

These have included differences in the nationality, race and morality of the character.

The term does not include honest error or honest differences of opinion.

Other problems included communication misunderstandings and differences in work management styles.

Other issues cited included significant differences in economy.