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.
1 An example of clean is a room that has just been vacuumed and dusted. 2  An example of clean os someone who is in Alcoholics Anonymous and who has been sober for four months.  An example of clean is a joke that has no sexual connotations or adult material.