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This article defines and explains type development across the lifespan and summarizes what other researchers have presented as a reference. A timeline for development is identified, and ways to differentiate development of a function from the development of other personality characteristics are described. Type development is about the dispersion of energy from an unconscious level to a managed conscious level. This development occurs in a spiral pattern, so development of each function occurs repeatedly but at higher levels of use and understanding each time. Although the dominant function develops most because of its innate drive to be the lead, each function can develop throughout the lifespan. The relative energy associated with each function always exists. When the energy is in the unconscious, it drives behavioural responses, but these are not within the individual's control. The ideal is to develop the conscious awareness of each of the functions so each can be consciously used as needed to match a situation. Because development of the functions is essential, this article examines potential interferences with development and then offers some suggestions for ways to promote developmental opportunities.