Use this tag for questions that ask why a nation/culture/region/country succeeds while another struggles. Development is a synonym for "comparative development" and "Development studies. Several H:SE members have referred to a "Guns, Germs, & Steel" tag.
Development, or more formally development studies, is the study of comparative development - what are the factors that determine that one culture/nation/region flourishes, while another struggles? What options are available, and which choices will lead to success?
It is very difficult to ask a successful question with this tag. Most questions about development are so broad that they produce a multitude of answers, few of which are supported by research. There is no scientific consensus on what strategies lead to development.