While instruments to measure experiences of breast screening and mammography have been developed in the past, there is none which (a) concentrates in depth on the experience of the examination itself, (b) includes detailed breast positioning variables, (c) has been designed based on robust and transparent qualitative evidence, and (d) has been validated in a UK breast setting. Such a tool is needed to inform the design, development and testing of interventions to improve experiences of mammography. This is an important goal because many women are deterred from future breast screening by poor mammography experiences. Furthermore, regular client satisfaction surveys are required by the UK national breast screening programmes but there is no standard, validated measure in place.