Individuals' compliance with group goals, in spite of the fact that group goals may be in conflict with individual goals
A number of people who happen to be in the same place at the same time
Effort to resolve a conflict through the use of a third party
Type of sampling that uses the differences that already exist in a population as the basis for selecting a sample; knowing the percentage of the population that falls into a particular category, the researcher then randomly selects a number of persons to be studied from each category in the same proportion as exists in the population