Plural planning theories: cherishing the diversity of planning

Spatial planning faces the brutal plurality of truths, exacerbated by constant crises and long-term transformation. When ideologically weaponized narratives replace ‘the truth’, planners no longer can validate their inputs into the planning process by referring to an undisputed base of knowledge. We present two approaches to planning theories that help understand why and how planners can address plural rationalities. One approach asserts that polyrationality is inevitable and planners need to listen to other voices, other rationalities. The other approach admonishes planners to choose wisely which worldview, rationality or bias they wish to follow and pursue. Finally, we invite the academic planning community to provide environments that allow for more theory-led debates. The AESOP Thematic Group Planning Theories will continue to provide one such forum.