Digital hand-drawn sketches provide a new and unique way of interacting with a prototype user interface design while it is still rendered as a sketch. The successful use of prototypes and scenarios for exploring design ideas is well documented. Hand-sketched designs have also been found preferable to formal diagrams during early design. The study reported here shows that interacting with digital sketches adds an exciting new dimension to the interface design process, we found that people do more revisions and more accurate revisions with digital sketches.