In the last three decades there has been an increasing emphasis on the importance of the use of fidelity assessment on improving the science of psychological, social, and behavioral research.
A cleanroom is an area or enclosure in which the air has to be cleaned to a defined particle limit, usually in particles per cubic foot. In the United States most cleanrooms are discussed in terms of Classification Limits.
A clean bathroom is a sign that the hotel room attendant assigned to the room has put considerable effort into the room's upkeep. Attendants must scrub the toilet, wash the shower/bathtub, scrub the floor and tidy the counter and sink.