Computational support for sketching is an exciting research area at
the intersection of design research, human–computer interaction, and
artificial intelligence. Despite the prevalence of software tools, most
designers begin their work with physical sketches. Modern computational
tools largely treat design as a linear process beginning with
a specific problem and ending with a specific solution. Sketch-based
design tools offer another approach that may fit design practice better.
This review surveys literature related to such tools. First, we describe
the practical basis of sketching — why people sketch, what significance
it has in design and problem solving, and the cognitive activities
it supports. Second, we survey computational support for sketching,
including methods for performing sketch recognition and managing
ambiguity, techniques for modeling recognizable elements, and human–
computer interaction techniques for working with sketches. Last, we
propose challenges and opportunities for future advances in this field

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