Topic: keystroke-level model for user interface evaluation

user interface > Group: testing and evaluating user interfaces

testing and evaluating user interfaces
collecting statistics on a UserInterface
coordinated motor programs
coordinated movement
ease of use
interactive response time

topics f-m
topics to process
Subtopic: keystroke model up

Quote: Keystroke model: the time required by an expert for a routine task is the time needed for the keystrokes [cardSK3_1979]
Quote: execution time in Keystroke model consists of keystrokes, mouse, hand movement, line drawing, mental preparation, and response time [cardSK3_1979]
Quote: keystroke-level model--the time for an expert to perform a task is determined by keystroke time [cardSK7_1980]
Quote: uses keystroke-level model to analyze 3 methods to correct a misspelled word [cardSK7_1980]

Subtopic: Fitts' law up

Quote: Fitts' law is empirically robust yet its theoretical foundations are weak; needs an information-theoretic foundation [goriJ9_2018]
Quote: information-theoretic model for pointing tasks and Fitts' law [goriJ9_2018]
Quote: Shannon's coding theorem should only consider minimum movement times for Fitts' law [goriJ9_2018]
Quote: multi-month study of Fitt's law; movement time and index of difficulty are uncorrelated [goriJ9_2018]
Quote: Fitts' law is a lower bound that cannot be passed by human performance [goriJ9_2018]
Quote: pointing and crossing tasks follow Fitts' law for task difficulty, direction of movement, discrete vs. continuous, time, target distance, and target width [apitG5_2010]
Quote: crossing fastest for large-nearby tasks while pointing fastest for small-far-away tasks [apitG5_2010]
Quote: can point with a mouse as fast as with a finger; a Fitts's law device [smitDC4_1982]
Quote: derive Fitts' Law by assuming that the relative accuracy of movement is constant; the measured time for acquiring a target is within the computed range [cardSK_1983]
Quote: use the steering law for trajectory-based tasks; like Fitts' law [accoJ5_1999]
Quote: discrete orthogonal pointing had the lowest error rate, 2.5%; others similar to Fitts' collinear pointing, 7.6%; target distance and width was significant [accoJ4_2002]
Quote: lag degrades human performance on interactive systems; measurable at 75 ms and degraded at 225 ms; developed Fitts-based model [mackIS4_1993]
Quote: Fitts' law also applies to constrained movement: speed of movement is linearly related to the normal constraint [accoJ3_1997]
Quote: Fitts studied reciprocal tapping between strips of metal, disc transfers between pins, and pin transfers between strips of holes [fittPM6_1954]

Subtopic: optimizing user interface up

Quote: survey of visual menu techniques for command menus; menu properties, methods for quality evaluation, predictive models, and menu optimization [bailG10_2016]

Subtopic: transcription typing up

Quote: studies of transcription typing have identified 34 phenomenons concerning interkey time, typing units, typing errors, eye movements, etc. [wuC5_2008]
Quote: the Queuing network-model human process (QN-MPH) can model 32 transcription typing phenomena [wuC5_2008]
Quote: skilled typists tap faster and have a larger eye-hand span; interkey time decreases by a power law [wuC5_2008]
Quote: transcription typing has a 4 character saccade time and a 400ms fixture duration [wuC5_2008]

Subtopic: typing errors up

Quote: 70% of typing errors are detected without reference to the text; pause after omission errors [wuC5_2008]
Quote: substitution errors involve adjacent keys; intrusion errors from short interkey time; transposition errors mostly cross-hand [wuC5_2008]

Subtopic: tapping up

Quote: tapping the center of the screen is the most accurate, followed by the sides, the top or bottom, and the corners; corners require twice as much space as the center [hoobS5_2015]

Subtopic: problems with keystroke model up

Quote: minimizing the number of keystrokes may not make a system easy to use; want overall simplicity [smitDC4_1982]

Subtopic: model cost of tasks relative to layout up

Quote: measure user interface, layout appropriateness by weighted costs of performing common tasks; yields faster performance and preferred layouts [searA7_1993]

Related up

Topic: collecting statistics on a UserInterface
Topic: coordinated motor programs
Topic: coordinated movement
Topic: ease of use
Topic: interactive response time

Subtopics up

Fitts' law
keystroke model
model cost of tasks relative to layout
optimizing user interface
problems with keystroke model
transcription typing
typing errors

Updated barberCB 7/04
Copyright © 2002-2023 by C.B. Barber
Thesa, Avev, and thid-... are trademarks of C.B. Barber