PaperCAD: A System for Interrogating CAD Drawings Using Small Mobile Computing Devices Combined with Interactive Paper

Table 11

Interpretation of cross-outs.

Event	Correct	Incorrect
Correctly interpreted	83
Ink capture failure (H)		1
Drew “” instead of “” (U)		4
Did not pause before writing new label or term (U)		6
Did not realize the ink was not a valid label or term (U)		8
Terms were not yet processed by the system (U)		2
Not recognized (S)		5
Location misinterpreted (S)		4
Total	83	26

H: hardware error; U: user error; S: system error.