The aim of this project is to develop, and obtain evidence for the validity of, a comprehensive toolkit of measures to evaluate experiences of mammography. The measures will be capable of assessing the quality of experiences of mammography and identifying modifiable predictors thereof. The investigators will pilot the measures in a sample of women attending for NHS breast screening. The resulting data will be used as the basis for building a statistical analysis model, for further validation of the measures, and for producing preliminary findings on what they are intended to measure.