A concept of ownership increasing in popularity as real estate prices rise. The purchase of an undivided interest (usually in a resort area condominium) for a fixed or variable time period. For example: Fifty-two different purchasers buy one condominium; each agrees to possession for one week per year. Costs (taxes, insurance, maintenance, etc. are shared equally. Possession may be fixed, or by reservation, by lease, license, etc. Some developers provide several projects in different parts of the world, so that a person owning one week in a project in Hawaii could elect to spend that week in a connected project in France or other area.