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Keystroke-level model. In human–computer interaction, the keystroke-level model ( KLM) predicts how long it will take an expert user to accomplish a routine task without errors using an interactive computer system. [1] It was proposed by Stuart K. Card, Thomas P. Moran and Allen Newell in 1980 in the Communications of the ACM and published in ...
More than 1 million downloads. This is the list of the Google Play paid apps with more than 1 million and less than five million downloads on unique devices: BlockP app : Website, Apps and Porn Blocker. 505 Games Srl.
Spiral viaduct of the Bernina Express near Brusio, Switzerland. A spiral (sometimes called a spiral loop or just loop) is a technique employed by railways to ascend steep hills. A railway spiral rises on a steady curve until it has completed a loop, passing over itself as it gains height, allowing the railway to gain vertical elevation in a ...