This module discusses social stratification systems using sociological perspectives. It defines social stratification as the classification of people into socioeconomic classes based on occupation, income, wealth, and social status. There are generally considered to be three main social classes: the upper class, middle class, and lower class. The module examines the different views of Karl Marx and Max Weber on social desirables and social class. It also explains the concepts of social mobility and the different types such as horizontal, vertical, upward, and downward mobility. Finally, it discusses some issues related to social stratification in the Philippines concerning wealth, income, ethnicity, gender, sexual orientation, and people with disabilities.