![]() This also means that progress bars can be designed to "feel" faster. These behaviors, coupled with humans' non-linear perception of time passing, produces a variable perception of how long progress bars take to complete. Consequently, progress bars often exhibit non-linear behaviors, such as acceleration, deceleration, and pauses. However, varying disk, memory, processor, bandwidth and other factors complicate this estimate. Typically, progress bars use a linear function, such that the advancement of a progress bar is directly proportional to the amount of work that has been completed. Myers concluded that the use of a progress bar reduced anxiety and was more efficient. Those who waited whilst watching a progress bar described an overall more positive experience. Myers' research involved asking people to run database searches, some with a progress bar and some without. In 1985, Brad Myers presented a paper on “percent-done progress indicators” at a conference on computer-human interactions. thesis, Monitoring System Behavior in a Complex Computational Environment. The chart thus now bears the name of Henry Gantt (1861–1919), who designed his chart around the years 1910–1915 and popularized it in the west.Īdopting the concept to computing, the first graphical progress bar appeared in Mitchell Model's 1979 Ph. Adamiecki did not publish his chart until 1931, however, and then only in Polish. In 1896 Karol Adamiecki developed a chart named a harmonogram, but better known today as a Gantt chart. The concept of a progress bar was invented before digital computing. There are also indeterminate progress indicators, which are not bar shaped. This bar uses motion or some other indicator (such as a barber's pole pattern) to show that progress is taking place, rather than using the size of the filled portion to show the total amount of progress, making it more like a throbber than a progress bar. The concept can also be regarded to include "playback bars" in media players that keep track of the current location in the duration of a media file.Ī more recent development is the indeterminate progress bar, which is used in situations where the extent of the task is unknown or the progress of the task cannot be determined in a way that could be expressed as a percentage. Sometimes, the graphic is accompanied by a textual representation of the progress in a percent format. User interface element A Windows 95 message box with a progress bar A simple animated progress barĪ progress bar is a graphical control element used to visualize the progression of an extended computer operation, such as a download, file transfer, or installation. ![]()
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