This paper describes our initial steps towards developing a model of how blind people comprehend tactile graphics. In the first half of the paper we set out the aims of the model, and then consider other key issues such as the nature and scope of the model, the information it must incorporate and the outcomes it should provide. In the second half of the paper we present our ideas for the model itself, outlining the four facets that make it up - perceptual processing, cognitive skills, knowledge and cognitive development Throughout the paper we raise questions for open debate and invite feedback on our ideas.
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