This helpdesk report provides a summary of available literature and evidence relating to childhood development stages; specifically, when is the best time to influence children’s thinking on global issues. This question is related to a second query covered in a separate helpdesk report that examines the development education landscape in the UK: specifically, what else apart from British Council’s Connecting Classrooms Programme is going on to build partnerships between schools in the UK and schools overseas? How many children/schools are part of something like this? These helpdesk reports are designed to help inform a business case and guide DFID’s thinking for a new approach to delivering development education in the UK when the current phases of Connecting Classrooms and the Global Learning Programme (GLP) ends. Key definitions and terminology can be found in Annex 1.