Keystroke-level model
Structure of the keystroke-level model

Keystroke-level model

Section Title: Structure of the keystroke-level model
Table Section Text: None

operator	time (sec)

K	total typing test time/total number of non-error keystrokes Guidelines: .08 (135 wpm: best typist) .12 (90 wpm: good typist) .20 (55 wpm: average skilled typist) .28 (40 wpm: average non-secretary typist) .50 (typing random letters) .75 (typing complex codes) 1.20 (worst typist and unfamiliar with the keyboard)

P	1.1

H	0.4

D	.9nD +. 16 lD

M	1.35

R	system dependent

suggested operators

B (mouse button press or release)	0.1

Click a Link/ Button	3.73

Pull-Down List (No Page Load)	3.04

Pull-Down List (Page Load)	3.96

Date-Picker	6.81

Cut & Paste (Keyboard)	4.51

Typing Text in a Text Field	2.32

Scrolling	3.96

Sentence(s)

M is 1.35 seconds as stated in the KLM.

final_sentence: M is 1.35 seconds as stated in the KLM.