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

Table 8

Interpretation of equations.

Event	Correct	Incorrect
Correctly interpreted	93
Ink capture failure (H)		3
Not written in the equation area (U)		1
Forgot to tap abort before writing new equation (U)		4
Incorrect division operator (U)		1
Incorrect multiplication operator (U)		4
Misinterpreted because of timeout (U)		9
Written correctly but at least one character misrecognized (S)		52
Total	93	74

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