Development Studies is a mulitdisciplinary subject with interest in: 

• Area studies
• Demography
• Demographics
• Development communication
• Development theory
• Ecology
• Economic development
• Engineering
• Environmental studies
• Geography
• Human security
• Migration studies
• Pedagogy
• Public health
• Social policy
• Sociology of development
• Urbanization
• Women's studies

For more information on development studies, see the Wikipedia article.