Transition theory proposes that people experience transitions throughout life. The theory identifies four factors (the 4 S's) that influence a person's ability to cope with transition: self, situation, support, and strategies. The self refers to personal characteristics like resilience and outlook. The situation encompasses characteristics of the transition event like timing and control. Support includes social networks and resources. Strategies are coping responses and how people manage stress. The theory provides a framework to understand transitions and identify resources to help people adapt.