Table A1.
A GOMS Task Analysis for Phone A in the Dial-a-Number Task
| Task analysis pathway | Operator | Young parameter time (ms) | Old parameter time (ms) | Net time (ms) young | Net time (ms) old |
|---|---|---|---|---|---|
| Step 1: Fixate 1st chunk of numbers on paper (1st 3 numbers) | F | 230 | 267 | 230 | 267 |
| Step 2: Encode first 3 digits | 3 C | 3 (70) | 3 (118) | 440 | 621 |
| Step 3: Fixate keypad | F | 230 | 267 | 670 | 888 |
| Step 4: Decode first chunk | C | 70 | 118 | 740 | 1006 |
| Step 5: Fixate first digit | F | 230 | 267 | 970 | 1273 |
| Step 6: Dial 1st digit | M | 70 | 146 | 1040 | 1419 |
| Step 7: Fixate second digit | F | 230 | 267 | 1270 | 1686 |
| Step 8: Dial 2nd digit | M | 70 | 146 | 1424.8 | 1980 |
| Fitts | 84.8 | 148 | |||
| Step 9: Fixate third digit | F | 230 | 267 | 1654.8 | 2247 |
| Step 10: Dial 3rd digit | M | 70 | 146 | 1824.8 | 2568 |
| Fitts | 100 | 175 | |||
| Step 11: Fixate 2nd chunk of numbers on paper (2nd 3 numbers) | F | 230 | 267 | 2054.8 | 2835 |
| Step 12: Encode second 3 digits | 3 C | 3 (70) | 3 (118) | 2264.8 | 3189 |
| Step 13: Fixate keypad | F | 230 | 267 | 2494.8 | 3456 |
| Step 14: Decode second chunk | C | 70 | 118 | 2564.8 | 3574 |
| Step 15: Fixate first digit | F | 230 | 267 | 2794.8 | 3841 |
| Step 16: Dial 1st digit | M | 70 | 146 | 2964.8 | 4162 |
| Fitts | 100 | 175 | |||
| Step 17: Fixate second digit | F | 230 | 267 | 3194.8 | 4429 |
| Step 18: Dial 2nd digit | M | 70 | 146 | 3264.8 | 4575 |
| Fitts | 0 | 0 | |||
| Step 19: Fixate 3rd digit | F | 230 | 267 | 3494.8 | 4842 |
| Step 20: Dial 3rd digit | M | 70 | 146 | 3697 | 5219 |
| Fitts | 132.2 | 231 | |||
| Step 21: Fixate last chunk of numbers on paper (last 4 numbers) | F | 230 | 267 | 3927 | 5486 |
| Step 22: Encode last 4 digits | 4 C | 4 (70) | 4 (118) | 4207 | 5958 |
| Step 23: Fixate keypad | F | 230 | 267 | 4437 | 6225 |
| Step 24: Decode last chunk | C | 70 | 118 | 4507 | 6343 |
| Step 25: Fixate first digit | F | 230 | 267 | 4737 | 6610 |
| Step 26: Dial 1st digit | M | 70 | 146 | 4955.5 | 7016 |
| Fitts | 148.5 | 260 | |||
| Step 27: Fixate second digit | F | 230 | 267 | 5185.5 | 7283 |
| Step 28: Dial 2nd digit | M | 70 | 146 | 5281.3 | 7475 |
| Fitts | 26.3 | 46 | |||
| Step 29: Fixate third digit | F | 230 | 267 | 5511.8 | 7742 |
| Step 30: Dial 3rd digit | M | 70 | 146 | 5740.3 | 8165 |
| Fitts | 158.5 | 277 | |||
| Step 31: Fixate fourth digit | F | 230 | 267 | 5970.3 | 8432 |
| Step 32: Dial 4th digit | M | 70 | 146 | 6188.8 | 8838 |
| Fitts | 148.5 | 260 | |||
| Step 33: Return with goal accomplished | C | 70 | 118 | 6258.8 | 8956 |
| Step 34: Fixate green send button | F | 230 | 267 | 6488.8 | 9223 |
| Step 35: Press green send button | M | 70 | 146 | 6558.8 | 9369 |
| Total time | 6.59 sec | 9.37 sec |
Note. In the Operator column, F refers to an eye fixation, M refers to a motor processing cycle, Fitts refers to the amount of time added to the motor processing cycle to press a button with a given width and distance from the starting position, and C refers to a cognitive processing cycle.