The developments in the Chaos Theory of Careers (CTC) are outlined for the last decade since the publication of the original formulation in this journal in 2003 (Pryor & Bright, 2003a). The history of the development of the CTC and the major theoretical constructs of the theory including context, complexity, change, chance, attractors, emergent patterns and fractals are described. The empirical evidence directly relevant to the CTC formulation and its efficacy as a counselling approach are reviewed. Practical tools to use with a CTC approach such as assessments, card sorts and counselling strategies are described. The impact of the CTC approach on practice and theory is discussed. Future applications of the CTC related to adaptability and cultural diversity are highlighted. It is concluded that the CTC provides the most coherent and comprehensive current account of career development behaviour that can incorporate both modernist and post-modernist perspectives. The last decade has demonstrated the theoretical and practical value of the CTC, but there remains enormous untapped potential to explore in the next decade.