| Outdoor play space | Kim (1998) | Physical play area, Creative play area, Role play area, Water play area, Kitchen garden, Resting area |
| Lee(2004) | Exercise play area, Dramatic play area, Static play area, Water and sand play area, Carpentry play area, Growth(animal and plant) area |
| Choi and Byun(2006) | Physical play area, Unstructured & dramatic play area (symbolic & construct play, etc.), Rest area, Natural exploration area(animals & plants observation, etc), Adventure play area |
| Nature play space(Forest play and ecological play) | Cosco and Moore(2009) | Dramatic play area, Open area, Pathway, Play equipment, Porch transition, Sandplay area |
| Davis et al.(2009) | Water space, Sand space, Plants and vegetation space, Trees and climbing space, Grass space, Tree trunks, logs, Boulders and hard landscaping space, Impact absorbing surfacing space, Loose-fill surfacing space, Landform space, Mud and digging patches space |
| Linden and Rarbarasch(2012) | Exploratory topography space, Small pieces space, Loose materials space, Sensory Awareness space, Different types of vegetation, Resting/quiet spots space, Different types of pond(Places for first-hand interaction space, Things to show change space), Outdoor art space, Physical challenges space, Opportunities to learn and teach space, etc.) |
| KFS*(2014) | Water play space, Soil play space, Rope play space, Creative play space (Natural looseparts space, Communication space, Balance facility, Indian house, etc.), Barefoot experience space |
| Moore. R.(2017) | Pathways, Plants, Natural surfacing, Natural loose parts, Natural construction, Natural play structures, Multipurpose lawns, Meadows, Woodland, Landform, Animals, Aquatics, Sand, Soil, Dirt Gathering, Program base & storage, Signage, Boundaries |
| Kang et al.(2016: 2017) Kang(2018) | Play facility space(Sand space, Facility playground, Deck space, Carpentry playground, Resting facility, Open space, Planting space), water space(eco-pond, valley etc.), Forest trail, Playground, Forest Study room(cum shelter) |