Although a whole school approach (WSA) to sustainability has been described as one of the most meaningful education approaches, the concept of WSA has not yet been widely explored within the context of preschool education, where the play, learning, and care are preconditions for a wholeness in childhood. The concept of the WSA considers raising quality and standard across entire education institution (Henderson & Tilbury, 2004). This approach also emphasizes the needs for (pre)school to engage children, teachers, parents, and the wider community in sustainability (Mogren, Gericke & Scherp, 2019). The principals have important roles to play in reforming and prioritizing preschools activities towards sustainability (Borg & Vintere...