The CircleUp project aims to understand household behaviour and attitudes in the transition towards acircular economy. The project has a particular focus on reducing waste related to four different domains;food, textiles, electronics, and packaging. This deliverable presents the training concept developed for the material efficiency advisors involved in theCircleUp project. It reflects on the roles and tasks of the advisors and explains the rationale for developing ahandbook as the central training concept instrument. The training concept is designed to support materialefficiency advisors in carrying out their activitiesto a similar extent across all countriesinvolved in the project,Germany, Latvia, Norway and the UK. The material efficiency advisors act as key facilitators between the project and the participating households.Through four household visits and by giving tailored support, the advisors motivate households to engage incircular practices in their everyday lives. In addition to supporting behavioural and attitudinal change among households, material efficiency advisorscontribute also to the evaluation of the CircleUp project. This includes supporting households in completinglongitudinal surveys conducted at four different time points and conducting individual and group interviewswith household members. Given the importance and complexity of these tasks, a handbook for material efficiency advisors has beendeveloped as the main training tool in the project. The handbook is included as an appendix to thisdeliverable.