The transitions adults negotiate across their working lives need to be further understood for governments, workplaces, and the community to effectively support these adults. Through analyses of worklife history interview data with 30 working age adults, distinct kinds of changes comprising these transitions have been delineated as representative of changes that have person-particular meanings and impacts. This delineation represents understandings of processes and outcomes for adults' learning and development. These transitions have specific kinds of scope, duration, and impacts in terms of continuity/discontinuity with individuals' earlier activities and knowing. Transitions can be objectively observed, captured, and represented by a complex of personal, institutional, and/or brute factors. Understanding the changes comprising these worklife transitions and how they can be supported and facilitated requires accounting for societal factors as well as individuals' personal histories and legacies and impacts of maturation. A schema representing six kinds of changes is presented and illuminated.