Table 1.

Differences between intended, actual, and logged durations in the timing validation study

Computer Load	Mean (ms)
	| Intended Duration – Actual Duration |			| Logged Duration – Actual Duration |
	System 1	System 2	Average	System 1	System 2	Average
Low	1.2	9.9	5.6	0.9	9.7	5.3
Med	2.2	10.9	6.6	1.8	9.6	5.7
High	1.5	9.5	5.5	1.4	10.1	5.8
Max	9.3	10.7	10.0	6.6	10.0	8.3
Average	3.5	10.2	6.9	2.7	9.9	6.3

System 1 = BTO laptop running Windows 7; System 2 = MacBook Pro running OSX 10.5.8