There is an emerging international consensus on the importance of developing 21st Century capabilities as part of education curricula. Yet, educators are uncertain about the definitions of the capabilities, and how to teach and assess them. This paper offers integrated curriculum as an effective way to resolve some of the challenges associated with developing the C21 capabilities. We present an overarching curriculum framework - the Know-Do-Be. Next, we identify the capabilities as they are described in various jurisdictions. Then we offer a backward design planning process that allows for creative and coherent curriculum design. Models of integrated curriculum are explored followed by research on the effectiveness of integration. Finally, we show how bringing together the competencies and integrated curriculum can create a rich learning situation. The paper concludes with recommendations for facilitating the foregrounding of the 21st Century capabilities through curriculum integration.