Changed planning for planned and unplanned change

Change, planned and unplanned, can be the product of events (change by chance), new language (change from societal interaction), and practices (track-bound change), and can involve many different societal actors. To position planning as an activity within this broader context, we present a model that captures the interplay between these three sources of change, leading to a typology of change-inducing phenomena. Change, consequently, can be managed in an active and effective way rather than being viewed as an environment of fuzzy conditions and unpredictable dynamics. Our model may be helpful to planners, as an analytic tool, usable in educational curricula as well as in the practice of planning.