Useful levels of analysis from Sociology: Understanding and Changing the Social World
Social categories: A collection of individuals who have at least one attribute in common but otherwise do not necessarily interact
Social Structures: Social patterns through which a society is organized
Sociological Perspective: The view that our social backgrounds influence our attitudes, behavior, and life chances
Social Norms: Cultural standards and expectations for behaving
Also consider concepts like social phenomena (collective behavior, social movements), systematic stratification, social control, deviance, social class, race and ethnicity, sex and gender, power and authority, social change, etc.