Theories about the family also differ in terms of the purposes that theorists have in formulating them. The most common goal is to provide a general description of how families work. In order to achieve a useful description, theories contain concepts. These concepts, such as cohesiveness, size, or patriarchy, help to compare families, and commonly have technical definitions. (Eisler, 2006, 111) Family theorists usually strive for clear and precise definitions, so that they may measure what happens when families are directly observed or when members report their ideas, feelings, and behaviors. Many concepts ...