Task trainers are used to teach and assess the individual performance of a particular task or procedure around a set of metrics (in the form of a checklist). The task is deconstructed from its natural context so that the learner can focus on the single task.
The learners should use the checklist they will be assessed against to learn the task/procedure. A trained observer uses the checklist to assess the individual’s performance to determine a predefined level of proficiency or mastery.