The landscape of skills development models is markedly diverse, as exemplified by the case studies that this book explores in detail. Some models work to create improvements within the existing education system, while others offer an alternative method outside of the traditional system. Some models are implemented by just one organization (either private, public, or nonprofit), while many draw upon the strength of multi-stakeholder partnerships to improve their quality, relevance, and sustainability. Many focus on harnessing new technology while others focus on strengthening the human element (indeed, many do both at the same time). However, across all models, some key themes have emerged that help us understand how these models can be particularly effective in improving the quality and relevance of education and the skills imparted to secondary level students.