Recent years have witnessed changes in the curricula used in Hong Kong international schools. Primary schools of the English Schools Foundation (ESF) and several in the private sector were previously using the National Curriculum of England and Wales (NC). The curriculum, however, was replaced with the International Baccalaureate's (IB) Primary Years Programme (PYP) in all ESF primary schools and in the international school discussed in this chapter. First-hand experiences as a primary classroom teacher during and after the transition phase with regard to the implementation of the PYP shall be discussed. Parents in terms of their initial concerns regarding lack of assessment and students in terms of adapting to changes in teaching style and the choices they had in personal learning approaches will also be discussed. Copyright © 2017 Springer Nature Singapore Pte Ltd.