This paper presents a framework to provide a structured approach for developing score reports for cognitive diagnostic assessments (CDAs). Guidelines for reporting and presenting diagnostic scores are based on a review of current educational test score reporting practices and literature from the area of information design. A sample diagnostic report is presented to illustrate application of the reporting framework in the context of one CDA procedure called the Attribute Hierarchy Method. Integration and application of interdisciplinary techniques from education, information design, and technology are required for effective score reporting. While the AHM is used in this paper, this framework is applicable to any attribute-based diagnostic testing method.