The 59-item Derriford Appearance Scale (DAS59; Moss, 2005) assesses appearance-related distress across various dimensions, including social anxiety, self-consciousness, and negative self-concept. The DAS can be administered both online and in-person to adolescents and adults and is available for £0.50 per use. This chapter first discusses the development of the DAS, which was created to address gaps in existing body image measures by capturing the broader psychological impact of visible differences. The DAS has a multidimensional factor structure, with five distinct factors identified through factor analysis, and strong psychometric properties, including high internal consistency (Cronbach’s alpha: .85 to .95) and test-retest reliability. This chapter also outlines the scale’s administration process, scoring procedures, and item response format. A shorter version, the DAS-24, is available for quicker assessments. The DAS has been validated across diverse demographic groups, ensuring its applicability in both clinical and research settings. Permissions and guidelines for use, including translations and modifications, are provided to ensure consistent and accurate application of the scale.