Temporal Aspectsof Usability Long-term Variation in User Actions Richard C. Thomas There has been little research into the study of long term adaptation by users or the extent to which usage is enhanced over a substantial period [1]. However, there is general agreement that some inter~ces, such as Unix shells and certain editors, take years to master. In this paper we present evidence that users do indeed change their actions in the long term. Some implications of our findings are discussed. and eighth deciles of experience. A command of modest rank, e.g. twenty, has a relative frequency of about O. 1%. -1 ^ -z -3 -4 I , "~IL.~.~, r-..<,~ [ o ~ Figure 1 z-curves for an individual user , , , , , decile 1 z-curve - decile 1 points o decile 8 z-curve ..... ~ i~c,.,,,~ ^ decile 8 points + The Experiment The data for this paper was collected over a period of three years from 1991. The users were 2273 computer science students at the University of Sydney, who used the sam editor on a discretionary basis during their studies. The editor has a window interface with a mouse, and also a command
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Long-term variation in user actions
Thomas, Richard C.
Follow ACM SIGCHI Bulletin
, Volume 28 (2)
Association for Computing Machinery – Apr 1, 1996
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