Title: Human-computer interfacing for the severely physically disabled
Abstract: Human computer interfacing issues and the need for design standards for switch operated integrated rehabilitation systems are discussed. Input methods and compatibility problems are summarised. Formulae for access times to menu structures for a number of single switch selection methods are given. Quantitative comparisons are given for example selection processes. It is concluded that row column scanning is fastest for small selection sets. Advantages and disadvantages of the use of multiple switches for input are indicated.