| 8 stages of psychosocial development: Nurture, shame, initiative, focus shifts from family to school, ID confusion, relationships, social contribution, and lastly finding meaning at the end of one's life. | |
| Proposed building middle range theories from a limited number of assumptions from which hypotheses are derived. -also distinguished between intended and unintended consequences of existing elements of social structure which are either functional or dysfunctional. | |
| Distinguished between dyad triad | |
| Statistical study of suicide |