Dynamic function is about changing who does what (function allocation) between computer(s) and human(s) depending on the situation. For example, a semi-autoomous car may be able to drive within lanes on a major highway in normal conditions, but the driver may need to take over if the system detects an unusal situaton ahead. The change may be initiated by the human user, for example, engaing cruise control, of by the systems, for exmape if the in-car system detected the c=driver had collaposed. A crucial desin issue for such systems is managing the handover when the change is from system to human control.
Used on Chap. 19: page 481