Researchers sometimes advance a theory to test, and they will incorporate substantial reviews of literature to identify research questions that need to be answered.
When the emphasis is equal, the problem may be one which a need exists to both understand the relationship among variables in a situation and explore the topic in greater depth.
"Since passage of the Civil Rights Act of 1964 and the Higher Education Act of 1965, America's colleges and universities have struggled to increase the racial and ethnic diversity of their students and faculty members, and "affirmative action" has become the policy-of-choice to achieve that heterogeneity."