describe services in which users are supposed to have an active role, because of the high level of uncertainty related to the user's behaviour. Because of the need for communication between inner mechanisms of services and actors (such as final users), representation techniques are critical in service design. For this reason, storyboards are often used to illustrate the interaction of the front office. Other representation techniques have been used to illustrate the system of interactions or a "platform" in a service (Manzini, Collina et al. 2004). Recently, video sketching (Jegou 2009, Keitsch et al. 2010) and prototypes (Blomkvist 2014) have also been used to produce quick and effective tools to stimulate users' participation in the development of the service and their involvement in the value production process. Public sector service design Public sector service design is associated with civic technology, open government, e-government, and can constitute either government-led or citizen-led initiatives. The public sector is the part of the economy composed of public services and public enterprises. Public services include public goods and governmental services such as the military, police, infrastructure (public roads, bridges, tunnels, water supply, sewers, electrical grids, telecommunications, etc.), public transit, public education, along with health care and those working for the government itself, such as elected officials. Due to new investments in hospitals, schools, cultural institutions and security infrastructures in the last few years, the public sector has expanded in many countries. The number of jobs in public services has also grown; such growth can be associated with the large and rapid social change that is in itself a trigger for fresh design. In this context, some governments are considering service design as a means to bring about better-designed public services. Denmark In 2002, MindLab, an innovation public sector service design group was established by the Danish ministries of Business and Growth, Employment, and Children and Education. MindLab was the one of the world's first public sector design innovation labs and their work inspired the proliferation of similar labs and user-centred design methodologies deployed in many countries worldwide. The design methods used at MindLab are typically an iterative approach of prototyping and testing, to evolve not just their government projects, but also the government's organisational structure using ethnographic-inspired user research, creative ideation processes, and visualisation and modelling of service prototypes. In Denmark, design within the public sector has been applied to a variety of projects including