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

Table 12

Perceived ease of drawing correctly recognized objects and equations. 10 = easy; 1 = hard.

	Mean	Std. dev.
Extension lines	9.2	0.8
Arrows	9.6	0.7
Area tracing	9.8	0.4
Labels	9.1	1.7
Equations	8.3	1.7