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A fast growing youth sports franchise, i9 Sports offers youth sports leagues, camps, clinics, and after school programs for children ages 3-14.  i9 Sports promotes "having fun, playing safe, and getting active in a healthy competitive environment while rewarding the value of good sportsmanship, leadership, and teamwork skills."

An imaginary companion is a friend whom a child creates, talks about, and interacts with on a regular basis. Young children use imaginary companions as a tool to help them make sense of the world.

Impact attenuation of playground surfacing material is the measure of its shock absorbing properties. The shock absorbing properties are measured by dropping an instrumented metal headform onto the surface and recording the force of impact and the time of deceleration.

Playground inspectors use a wide array of gauges and tools in their inspections to be sure playgrounds meet the safety specifications detailed in the appropriate ASTM International Standards and the U.S. Consumer Product Safety Commission Public Playground Safety Handbook. Inspectors learn what the tools are and how to use them when taking the Certified Playground Safety Inspector training sponsored by the National Recreation and Park Association.

Interactive play environments involve a combination of elements that interact with each other as children play. Natural materials, such as sand and water, allow for hands-on, active manipulation that enhances learning as well as the play experience. Playing outdoors offers a rich variety of play opportunities with natural elements, such as plants, trees, flowers, dirt, mud, animals, and insects. In these rich environments, child's play involves the whole child combining gross motor skills, fine motor skills, senses, emotion, intellect, individual growth, and social interaction.

The National Museum of Play in Rochester, New York, later known as The Strong, created the International Center for the History of Electronic Games in 2009. The ICHEG collects, studies, and interprets how video games and electronic games affect the ways people play, learn, and connect across cultural and geographical boundaries.

The International Journal of Play is an inter-disciplinary publication that focuses on all facets of play. It is published by Routledge, a distinguished publisher of leading educational research since 1836. The first issue of the International Journal of Play was released in March of 2012 with three issues published yearly.

International Play Association USA is the national affiliate of International Play Association World, an interdisciplinary, international, non-governmental organization founded in Denmark in 1961. The membership of this organization is open to all persons or groups that endorse the United Nations' Declaration of the Rights of the Child (1959) which state: "The child shall have full opportunity for play and recreation which should be directed to the same purposes as education; society and the public authorities shall endeavor to promote the enjoyment of this right."

The International Play Equipment Manufacturers Association (IPEMA) was formed in 1995 by a group of twelve playground equipment manufacturers. IPEMA is a nonprofit, membership trade association with the goal of representing and promoting an open market for manufacturers of playground equipment and surfacing.

The International School Grounds Alliance (ISGA) is a global network of organizations and professionals dedicated to improving the design and utilization of school grounds in order to enrich children's learning and play.

In October of 1995, the International Play Equipment Manufacturers Association (IPEMA) was formed by a group of twelve playground equipment manufacturers. They saw the need for a trade organization that would provide third-party physical validation of compliance to the safety standards as outlined in the ASTM International (ASTM) F1487.