A Systematic Review of Modifications and Validation Methods for the Extension of the Keystroke-Level Model

Figure 7

A bar chart of the collated operators and the frequency of adoption by the primary studies reviewed. The groups reflect the device setups previously discussed in Section 5.2.2: traditional, key-based mobile, touch-based mobile or tablet, traditional IVIS, touch-based IVIS, specialised, post-GUI, and TV.