Thirty subjects used a process control simulation to make six batches of ice cream each, using touchscreen input three times and speech input three times. Touchscreen and speech inputs were statistically compared for time to task completion, process control related errors, wrong input mode errors, input-device-related errors, total errors, and opinions about preferences and feelings of control.
A touchscreen is the recommended operator input device for control of simple batch processes, based on the results of this experiment.
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