The purpose of this chapter is to formulate a dynamic, integrated, systemic Organisational Identity (IO) Life Cycle Model. This model can be used by organisations to assess the life cycle stage and maturity of their OI, enabling them to undertake appropriate, durable Identification Work. Using a musical tuning fork, producing harmonic resonance as basic metaphor, we envisage that our OI tuning fork—representing in its totality a dynamic, integrated, and systemic Organisational Identity Life Cycle Model—is made up of three prongs: the Organisational Life Cycle; the OI Life Cycle; and, the Organisational Members’ Identification Life Cycle. The concept ‘Organisational Identity Life Cycle Maturity’ is explicated, enabling one to assess the maturity of an OI Life Cycle.