Table 1.

Organizing Concepts and Principles in the Life Course

TermDefinition
TrajectorySequences or long-term patterns within a focal area (eg, health, family, or work situations) that are embedded in social pathways and defined by social institutions and interpersonal relationships.
TransitionChanges in state that are discrete, acquire meaning within trajectories, and have an identifiable beginning and end.
Turning pointIndividual or institutional sentinel moments that result in a change of direction along one’s life course.
Linked livesThe interdependence and network of shared relationships that surround individual lives.
Social convoyA grouping of significant others (eg, important family members, long-time friends) across different life periods.
TimingThe developmental antecedents and consequences of behavior patterns, life events, and transitions that vary according to their chronological location in a person’s life.
Human agencyViews people as active participants who construct their own life courses through the choices and actions they take, given the opportunities and constraints of history and social circumstances.