| Enter a 16-digit code into a program | Model= : Older Adult | operator | value old | |||||||
| Operator Description | Operator | Iterations | Duration | Total Time | Summed Time | c | 118 | |||
| Fixate password | e | 1 | 267 | 267 | 267 | e | 267 | |||
| Decide to encode a chunk of 4 di= gits | c | 1 | 118 | 118 | 385 | f | 175 | |||
| Encode first 4 digits | c | 4 | 118 | 472 | 857 | m | 146 | |||
| Decide to view screen | c | 1 | 118 | 118 | 975 | p | 178 | |||
| Fixate screen | e | 1 | 267 | 267 | 1242 | |||||
| Find code entry section | p | 1 | 178 | 178 | 1420 | operator | value young | |||
| Decode 1st digit | c | 1 | 118 | 118 | 1538 | c | 70 | |||
| find key to strike | p | 1 | 178 | 178 | 1716 | e | 230 | |||
| move to key | f | 1 | 175 | 175 | 1891 | f | 100 | |||
| strike key | m | 1 | 146 | 146 | 2037 | m | 70 | |||
| Decode 2nd digit | c | 1 | 118 | 118 | 2155 | p | 100 | |||
| find key to strike | p | 1 | 178 | 178 | 2333 | |||||
| move to key | f | 1 | 175 | 175 | 2508 | c=3Dcognitive cycle time | ||||
| strike key | m | 1 | 146 | 146 | 2654 | e=3D eye fixation time | ||||
| Decode 3rd digit | c | 1 | 118 | 118 | 2772 | f=3Dfitts' law time estimate= | ||||
| find key to strike | p | 1 | 178 | 178 | 2950 | m=3Dmotor cycle time | ||||
| move to key | f | 1 | 175 | 175 | 3125 | p=3Dperceptual cycle time | ||||
| strike key | m | 1 | 146 | 146 | 3271 | |||||
| Decode 4th digit | c | 1 | 118 | 118 | 3389 | |||||
| find key to strike | p | 1 | 178 | 178 | 3567 | |||||
| move to key | f | 1 | 175 | 175 | 3742 | |||||
| strike key | m | 1 | 146 | 146 | 3888 | |||||
| iterated 4=3D | = 15.6 | s | ||||||||
| = | ||||||||||
| Model: Younger Adult | ||||||||||
| Fixate password | Operator | Iterations | Duration | Total Time | Summed Time | |||||
| Decide to encode a chunk of 4 di= gits | e | 1 | 230 | 230 | 230 | |||||
| Encode first 4 digits | c | 1 | 70 | 70 | 300 | |||||
| Decide to view screen | c | 4 | 70 | 280 | 580 | |||||
| Fixate screen | c | 1 | 70 | 70 | 650 | |||||
| Find code entry section | e | 1 | 230 | 230 | 880 | |||||
| Decode 1st digit | p | 1 | 100 | 100 | 980 | |||||
| find key to strike | c | 1 | 70 | 70 | 1050 | |||||
| move to key | p | 1 | 100 | 100 | 1150 | |||||
| strike key | f | 1 | 100 | 100 | 1250 | |||||
| Decode 2nd digit | m | 1 | 70 | 70 | 1320 | |||||
| find key to strike | c | 1 | 70 | 70 | 1390 | |||||
| move to key | p | 1 | 100 | 100 | 1490 | |||||
| strike key | f | 1 | 100 | 100 | 1590 | |||||
| Decode 3rd digit | m | 1 | 70 | 70 | 1660 | |||||
| find key to strike | c | 1 | 70 | 70 | 1730 | |||||
| move to key | p | 1 | 100 | 100 | 1830 | |||||
| strike key | f | 1 | 100 | 100 | 1930 | |||||
| Decode 4th digit | m | 1 | 70 | 70 | 2000 | |||||
| find key to strike | c | 1 | 70 | 70 | 2070 | |||||
| move to key | p | 1 | 100 | 100 | 2170 | |||||
| strike key | f | 1 | 100 | 100 | 2270 | |||||
| m | 1 | 70 | 70 | 2340 | ||||||
| iterated 4 times = =3D | 9.36 | s |