Task model. A task is simply something specific that test
developers ask a test taker to do that will be scored, such as select an
option in a multiple choice item, write an essay, or take the required
action in response to a performance item. A task model is a
description of the characteristics that define a group of tasks. The
task model should, of course, be linked to the aspect(s) of the
evidence model for which it will provide information.