The design goals based on the human factors may be set as follows:
Multi-access functional activation is best for optimizing interaction in situations that the users may experience the first time.
Single-access functional activation is best for reducing the error rate, which enables carefree interaction.
Multi-access functional activation may be appropriate in special features of routine interaction modes.
Because the user performance and reliability are most important for routine and recovery interaction, single-access is the preferred style for these interaction modes.
Updated on 29 Feb 2016.