The desktop walkthrough is a service design prototyping technique in which a team uses miniature props, paper cutouts, and a scaled floor plan to simulate a full-scale service experience at a tabletop level. Developed by Bill Hollins and Gillian Hollins and popularised further in service design practice, it allows teams to walk through a service blueprint in three dimensions and in real time, identifying operational problems, spatial conflicts, and experience failures before any physical or digital investment has been made.