The maximum fall height from which a life threatening head injury would not be expect to occur is defined as critical height. ASTM F1292 uses critical height to assess impact attenuation of playground surfacing. The testing for critical height is typically done in a laboratory, however, testing may also be done in the field using the F1292 testing methodology.

Starting in Minneapolis in 2005 by Todd Lehman, Cre8Play introduced creativity in designing commercial playgrounds with nature themed play structures and custom built designs.

A toy developer and manufacturing company, Coleco was most famous for the home video game system, ColecoVision, and the Cabbage Patch dolls. Coleco also produced wading pools, doll carriages, tabletop hockey games, electronic hand-held games, Power Cycle plastic tricycles, pinball machines, pool tables, and sleds.

The definition of a completely bounded opening is any opening in a piece of play equipment that is totally enclosed by boundaries on all sides so that the perimeter of the opening is continuous.

Early in the twentieth century, Josephine D. Randall was one of the first women to direct a municipal playground department and a major recreation department. Over twenty five years she led the San Francisco Recreation Department from inception to being a national noteworthy example of quality.