| Evaluation
Models |
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| • | Keystroke Level
Model (Card et al. 83) |
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| – | Used previously
in SMS (Dunlop and Crossan 00, Kieras 01) |
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| – | Problem:
keystrokes are weighted equally |
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| • | We developed an Operation
Level Model |
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| – | Similar to
(Pavlovch and Stuerzlinger 04) |
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| – | Tie keystrokes to
one of 13 operation types |
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| (e.g., |
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| enter a symbol = MPSymK, |
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| directional keypad move = MPDirK, |
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| press a different key to enter a letter =
MPAlphaK |
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| press a same key to enter a letter =
RPAlphaK |
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