Transition theory proposes that transitions involve changes in relationships, routines, assumptions, and roles. A transition is defined as any event or non-event that results in such changes. The meaning of a transition depends on how the individual perceives it. Schlossberg's transition theory analyzes transitions based on their type, context, and impact. It was later revised to include three components: approaching change, taking stock using the 4 S's (situation, self, support, strategies), and taking charge by moving in, moving through, and moving out of the transition.