Strata management, sometimes known as "body corporate management", is a specialist area of property management involving the day-to-day operation and management of a property that is jointly owned and comprises multiple units, common areas and common facilities. It is derived from an Australian concept of property law called strata title applied to the administration of common ownership in apartment buildings on multiple levels, or strata. Emerging markets in Dubai, Abu Dhabi, the Philippines and India have adopted the Australian system. It is one of the fastest growing forms of housing in the United States today, similar to common-interest development (CID), a category that includes planned unit developments of single-family homes, known as homeowner associations (HOAs), condominiums, and cooperative apartments.