In the frame of the task, the thing to be done owns the attention of the doer. The doer’s attention is released when the task is done. The idea of multitasking is to engage with a portfolio of tasks, rapidly switching attention among tasks, or initiating actions that affect more than one task. The critique of multitasking states that the energy expended on switching and re-engaging among tasks lowers overall productivity.
echovar über Tasks und Multitasking