Glossary
independent parts into a coordinated whole to improve performance
through controlled interaction. 2. the joint use of a component by two or
more systems.
TOTAL OWNING COST. the sum of all costs, regardless of funding
source, attributable to owning a building, or a particular system or
component within a building. Owning cost is typically broken down into
first, operating, maintenance, alteration and replacement costs.
TRADE-OFF. choice between alternatives based on evaluation of
differences in characteristics such as cost, performance, appearance, etc.
UNCOUPLING. a planning or design activity involving the disconnection
or disentanglement of components to alleviate interference or provide
clarity.
UNIT. 1. a structurally independent assembly performing a specific
function or range of functions. 2. a functionally related set of people,
equipment, spaces, missions and activities considered collectively for
planning and administrative purposes. See FUNCTIONAL UNIT.
3. a module.
USER NEEDS. those conditions the users of a building consider
necessary or desirable as environment and support for their activities,
without particular reference to how such conditions are to be provided.
USER REQUIREMENTS. 1. user needs. 2. performance requirements
established directly by a user.
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