Common-interest development (CID) is the fastest growing form of housing in the world today. They are commonly known and seen as condominiums, timeshares, planned developments, along with other titles and descriptions. The ownership benefits of a CID are to have rights to an undivided interest in common areas and amenities which might prove to be too expensive to be solely owned. For example, an owner would like to have a pool but cannot afford one on his own. When buying a condominium with a pool in a CID of one hundred units, an owner would have use of that pool for basically one-hundredth the cost due to sharing this cost with the other 99 owners. Timeshare, or vacation ownership, is the same concept. Where buying a second home for vacation purposes might not be financially possible, buying a week or two can be when sharing the overall costs with other participants.