Function allocation is the process of determining which tasks should be performed by a human and which by automation. In some systems this is a single design time choice based on assessment of isseus such as different capabilities and responsibility, for example, using a spreadsheet to add up the items in a child's birthday wish list but leaving it ti thte parent to decide if it is too much Other systems use dynamic function allocation, varying who does what depending on the precise circumstances at any moment.
Used on Chap. 19: page 481