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Diagrams often appear as node-link representations in many contexts, such astaxonomies, mind maps and networks in textbooks. Despite their pervasiveness,they present significant accessibility challenges for blind and low-visionpeople. To address this challenge, we introduce Touch-and-Audio-based DiagramAccess (TADA), a tablet-based interactive system that makes diagram explorationaccessible through musical tones and speech. We designed and developed TADAinformed by insights gained from an interview study with 15 participants whoshared their challenges and strategies for accessing diagrams. TADA enablespeople to access a diagram by: i) engaging in open-ended touch-basedexplorations, ii) allowing searching of specific nodes, iii) navigating fromone node to another and iv) filtering information. We evaluated TADA with 25participants and found that it can be a useful tool for gaining differentperspectives about the diagram and participants could complete severaldiagram-related tasks.

TADA: Making Node-link Diagrams Accessible to Blind and Low-Vision People