Figure 1: Nomon being used to enter the phrase "should i start playing it again". The user has typed "should i st" thus far. To write the letter "a", the user clicks a switch when the clock near "a" is at noon. Target selection may require multiple clicks depending on the user's switch precision (visualized by the histogram). The user can select word completions to speed writing.

Some individuals with motor impairments communicate using a single switch -such as a button click, air puff, or blink. Our software, Nomon, provides a method for single-switch users to select between items on a screen. Nomon's flexibility stems from its probabilistic selection method, which allows potential options to be arranged arbitrarily rather than requiring they be arranged in a grid. As a result, Nomon can be used for a host of applications -including gaming, drawing, and web browsing. Focusing on accessibility, we updated the Nomon interface in collaboration with a switch user and with experts in Augmentative and Alternative Communication (AAC). We present our updated Nomon interface as an open-source web application. CCS CONCEPTS• Human-centered computing → Accessibility technologies; Accessibility systems and tools; Keyboards.

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