Review Article
A Systematic Review of Modifications and Validation Methods for the Extension of the Keystroke-Level Model
Table 2
Heuristic rules for
M operator placement [
6].
| Rule 0 | Insert Ms in front of all Ks that are not part of an argument string. Place Ms in front of all Ps that select commands. | Rule 1 | When an operator following an M is fully anticipated in the operator just prior to M, remove the M. | Rule 2 | When a string of MKs belongs to a cognitive unit, delete all Ms except the first. | Rule 3 | When a K is a redundant terminator, delete the M prior to the K. | Rule 4 | When a K terminates a constant string, delete the M prior to the K; however, do not delete the M when the K terminates a variable string. |
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