MCSA is the peak body which supports, enhances and advocates for mobile children's services in NSW. MCSA represents mobile children's services with qualified outreach educators that deliver quality early learning and care services where centre-based delivery is not readily available or is inaccessible to families.

Mobile children's services largely work with vulnerable and marginalised children and communities. The mobile children's services sector is made up of a variety of models that respond to community need. Outreach education and care models include preschool, long day care, occasional care, supported playgroups, play sessions and toy libraries that are delivered to families through a 'mobile' format. Mobile children's services, including preschools, operate from non-purpose built venues such as community halls and schools.