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

Table 15

Data extraction form.

RQ#	Research question	Answer
RQ1	What was the purpose of extending the KLM?
RQ1	What was the intended device and setup?
RQ1	What was the application domain?
RQ1	Who were the intended users included in the experiment?
RQ2	What research method was used to extend the KLM operators or modify heuristics?	○ Experiment
		○ Literature
		○ Observation
		○ Other
RQ2	What research method was used to extend the KLM operators’ unit times?	○ Experiment
		○ Literature
		○ Observation
		○ Other
RQ2	What were the users’ skill levels?
RQ3	How was the original KLM extended?	○ KLM operators preserved
		○ KLM operators discarded
		○ Adapted operators
		○ New operators
		○ New equations
		○ Updated heuristics
		○ Application metrics
RQ4	What research method was used to validate the extended KLM?	○ Experiment
		○ Literature
		○ Observation
		○ Other
RQ4	How was performance measured?	○ Correlation analysis
		○ RMSPE
		○ MAPE
		○ Other
RQ4	What was the overall performance of the extended KLM?
RQ4	Was the performance of the extended KLM better than that of the original?	○ Better
		○ Worse
		○ Unclear
		○ Not measures
		○ Other