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Block-based programming languages are a popular means to introduce novices, specifically children, to programming and computational thinking concepts. They are tools to broaden participation in computing. At the same time, block-based languages and environments are an obstacle in broadening participation for many users with disabilities. In particular, block-based programming environments are not accessible to users who are visually impaired. This lack of access impacts students who are participating in computing outreach, in the classroom, or in informal settings that foster interest in computing. This paper will discuss accessibility design issues in block-based programming environments, with a focus on the programming workflow. Using Google’s Blockly as a model, an accessible programming workflow is presented that works alongside the conventional mouse-driven workflow typical of blockbased programming. The project presented is still in progress.

Design Considerations to Increase Block-based Language Accessibility for Blind Programmers Via Blockly