Johnny Accot & Shumin Zhai (1997)
Proceedings of the ACM SIGCHI Conference on Human factors in computing systems, 295-302.
DOI: https://doi.org/10.1145/258549.258760
Abstract. Introduces the steering law, a linear (rather than logarithmic) generalisation of Fitts's Law to constrained trajectory-following tasks such as moving through a tunnel. Directly relevant to cascading menus and narrow drag paths, which are much more sensitive to width than pointing tasks are.
Tags: fitts steering-law motor-control