To enable multitasking, the five to nine data items are allocated to both the tasks and the task management, implying that in the interaction, only three to seven data items can be manipulated simultaneously.
With experience, the workload decreases because part of the data required for the processing is stored in the unlimited, long-term memory.
Mental workload issues are relevant to the search style dilemma. They imply that the visual search is best in routine operation and that interactive search may be better in non-routine procedures.
Updated on 12 Sep 2016.