Current user interface construction tools make it difficult
for a user interface designer to illustrate the behavior of an
interface. These tools focus on specifying widgets and
manipulating details such as colors. They can show what
the interface will look like, but make it hard to show what
it will do. For these reasons, designers prefer to sketch early
interface ideas on paper. We have developed a tool called
SILK that allows designers to quickly sketch an interface
electronically. Unlike paper sketches, this electronic sketch
is interactive. The designer can illustrate behaviors by
sketching storyboards, which specify how the screen should
change in response to user actions
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