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2009

Estimating Productivity: Composite Operators for Keystroke Level Modeling

8 years 2 months ago
Estimating Productivity: Composite Operators for Keystroke Level Modeling
Task time is a measure of productivity in an interface. Keystroke Level Modeling (KLM) can predict experienced user task time to within 10 to 30% of actual times. One of the biggest constraints to implementing KLM is the tedious aspect of estimating the low-level motor and cognitive actions of the users. The method proposed here combines common actions in applications into highlevel operators (composite operators) that represent the average error-free time (e.g. to click on a button, select from a drop-down, type into a text-box). The combined operators dramatically reduce the amount of time and error in building an estimate of productivity. An empirical test of 26 users across two enterprise web-applications found this method to estimate the mean observed time to within 10%. The composite operators lend themselves to use by designers and product developers early in development without the need for different prototyping environments or tedious calculations.
Jeff Sauro
Added 18 Feb 2011
Updated 18 Feb 2011
Type Journal
Year 2009
Where HCI
Authors Jeff Sauro
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