"8 stages of psychosocial development"

This is a theory developed by Erik Erikson, and here is a link to the summary chart. It's apparently based on the work of famous Austrian psychiatrist Sigmund Freud.

I'm not saying whether I think this theory is true or not. It does give an insight into how some in the human psychology industry conduct analysis through their work. This is apparently taught to students, as the website disclaimer reads:

This web site was created for use by students in PSY 501. The material on these pages is not intended for use by individuals not enrolled in that course.