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

Table 13

Perceived usability.

	Mean	Std. dev.
Equation interpretation accuracy	8.4	1.2
Ease of correcting labels/equations	8.7	1.3
Ease of using reinterpretation	9.1	1.0
Clear feedback	9.9	0.3
Prefer concise audio mode	5.3	3.6
Usefulness of LCD	5.8	3.8
Ease of using LCD	9.7	0.7
Ease of learning the system	9.7	0.7
Overall usability	9.6	0.7
Similarity to paper and pencil	8.9	1.1
Prefer pen-based to WIMP	8.8	1.3