Knowledge application environment
Learning is not completed until the worker applies new skills in practice: closes a cold sale, makes a presentation at a conference, notifies an employee of dismissal. These are real-life stressful situations, which turn abstract units of content into concrete competence in sales, public speaking or communication.
Practical tasks, interface and dialogue simulators help take this step, but not substitute it, because the learning environment is safe. There you cannot fail a real project, lose a client or look ridiculous, but only by taking risk is it possible to really learn.