When selecting technology, whether for new construction of a renovation, it is important to obtain details about the advantages and disadvantages of open versus proprietary systems to make an informed choice among the various possibilities. Since an extremely high degree of flexibility is required over the entire lifecycle of a building, the planners should consider the not only current situation, but also other usage options that may develop in the future. Therefore, components should be available over the long term, and should meet established open technology standards.