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The early twentieth century Frenchman Roger Caillois was a scholar who studied topics in sociology, biology, anthropology, geology, linguistics, religions, and mythology and how they interconnect and influence each other.

Originally founded as Camp Fire Girls, Camp Fire USA is a national youth development organization that serves boys and girls, with an emphasis on school-aged children. Camp Fire USA's program encompasses four core areas: Caring, Camping, Contributing, and Connecting.

Carter Oosterhouse founded a non-profit organization called Carter's Kids. The purpose of Carter's Kids is to increase a child's activity level by building and developing community parks and playgrounds in their neighborhoods.

Founded in 1978, Cemrock Naturalistic Environments constructs, fabricates, and installs concrete landscaping features and realistic exhibits for zoos, aquariums, parks, playgrounds, and museums.

The Certified Park and Recreation Executive certification is a mastery-level certification program for park and recreation management and administration professionals. The Certified Park and Recreation Executive certification is offered by the National Recreation and Park Association.

A Certified Playground Safety Inspector has passed the National Recreation and Park Association National Playground Safety Institute's examination. The ASTM International and the U.S. Consumer Product Safety Commission are the safety standards used for this test.

The Charleston Park Conservancy (CPC) Garden in the Parks program is managed by the Charleston Park Angels volunteers. The Charleston Park Angels seek to connect the community to the city's parks through vision, education, and involvement.

Various hazardous chemicals and poisons can sometimes be found in a playground environment. These chemicals and poisons are the result of treatments applied to play equipment or living organisms that affect playground areas.

Launched in 2003, Chicago Toy & Game Group is a series of events, awards, and resources to encourage invention of toys and games. The Chicago Toy & Game Week hosts the International T&G Conference, TAGIE Awards, the Social Media @ Play Conference, the I-SPI, the Play with Purpose Conference, the Youth Inventor Challenge, and the free two day ChiTAG Fair.

A commercial playground equipment manufacturer, Childforms offers a full line of modular play structures and play environments for early childhood and elementary market. They believe in "offering quality products at a fair price with excellent customer service" and in "assisting our children in learning about the health benefits of outdoor play."

Children & Nature Network was founded in 2006 to address the Nature Deficit Disorder issue raised by Richard Louv's book Last Child in the Woods. Richard and five other leaders in diverse fields created the nonprofit Children & Nature Network with the initiative to "Leave No Child Inside." Their mission was to reconnect children to nature for two purposes: the physical health, cognitive development, and emotional well-being of the child, and the good of the planet.

Children On Playgrounds: Research Perspectives and Applications is a collection of research and review papers edited by Craig H. Hart that sheds light on practical child development issues in the context of outdoor play environments.

The California Roundtable on Recreation, Parks and Tourism identifies ten outdoor activities that represent the basic outdoor needs of children for healthy development called the Children's Outdoor Bill of Rights. Many other states have adopted their own Children's Outdoor Bill of Rights to encourage outdoor and nature play.

Dr. Keith M. Christensen is a landscape architect, professor, researcher, and the founder and director of Beyond Access, a program which offers technical assistance when designing inclusive play environments. He believes that "Inclusive play experiences help children with and without disabilities discover that they are competent and capable, able to take risks, climb higher, think harder, and foster friendships."

Throughout history and around the world children have been playing clapping games. Hand clapping, often in complex patterns while chanting rhymes, requires concentration, coordination, and cooperation with at least one other child.

Climbinet was founded in 2010 to offer more affordable rope play structures for outdoor climbing. Without sacrificing durability or safety standards, Climbinet manufactures climbing rope structures with unique technical features that increase durability.

Cognitive development is a natural mental process of growth of perception, memory, judgment, reasoning, and other conscious intellectual activity.

John Amos Comenius was an education reformer and religious leader who is now known as the Father of Modern Education. He revolutionized education in the way school systems were set up, created a general theory of education around the idea of children learning at a natural pace from simple concepts to challenging theories, and wrote a series of textbooks on teaching methods and subject matter for children.

Competition is rivalry for supremacy, which may result in a prize, honor, or advantage. Competition is about winning and losing; if someone wins, then one or more children lose. Competition is a learned behavior.

The concrete operational stage is the third of four stages proposed by Jean Piaget to describe the cognitive development of infants, children, and adolescents. The concrete operational stage typically involves children from ages 7-12.

When children manipulate their environment to create things, they are engaged in constructive play. Experimenting with materials, they can build towers with blocks, construct objects with miscellaneous loose parts, play in the sand, and draw sidewalk murals with chalk.

A non-profit organization focusing on advocacy, research, education and service, the Consumer Federation of America has a membership of over 50 million individuals and 280 organizations. CFA focuses on four areas: advocacy, research, education and service.

Cooperation is the act of working together for a common purpose. Cooperation is a learned behavior that can be improved and modified, which is especially developed during childhood.

The definition of coordination is the ability to develop patterns of movement efficiently integrating visual information with the movement of the limbs. In children, coordination of motor skills develops as the child ages and experiences new activities.

Robert W. Crawford had a long and distinguished career in park and recreation and was recognized as one of the greatest leaders in the field. He was influential in transforming the way cities and residents viewed parks.

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

The game of Croquet is played by hitting a ball through a series of wire hoops with a mallet. As a fun backyard activity for children and adults alike, this game has been popular in the United States since its introduction in the mid-1800s.