In architecture, a brief is a statement of a client's requirements, which form the basis for appointing an architect. The brief describes the requirements that need to be reconciled and accommodated, and is developed first as a design which is submitted for approval, and subsequently constructed as a building or other structure. A brief is a written document that might be anything from a single page to a multiple volume set of documents. The term program is often used today, in conjunction with, and in part as a synonym of, an "architectural brief". "Program" is used more often in the United States whereas "brief" is used internationally. An architect's design is considered the response to the building program. Development of the brief The architectural brief is often formulated by, or in collaboration with, the architect. It often includes opportunities assessed, constraints identified and needs for further investigation clarified. In the early stages of the design process the brief may be continuously reappraised as the requirements become clearer - this is known as 'firming up the brief'. Ultimately, a clear set of instructions setting out the overarching goals and detailed requirements will emerge which form the starting point of the architect's designs and will be continually tested against, as designs are progressed. Schedule of accommodation In the later stages of writing a brief, a schedule of accommodation is sometimes drawn up that will specify precisely the number and size of rooms that will be required, the relationships between rooms and groups of rooms, the finishes, equipment, furniture that will fit the room for its functional purpose and the environmental conditions that will assist the purpose. Environmental conditions might include temperature range, humidity, air movement, acoustic isolation, etc..The schedule of accommodation is prepared by an expert to help in determining the minimum space required on site to develop and finish a given design. The schedule of accommodation is guided by the brief analysis of every space since every space have set standards and requirement. Complex briefs For complex facilities, the brief may be prepared by a specialist consultant, separate from the design architect. In such projects, workshops are often employed with project participants: owners, users, customers, facility experts, builders/contractors and other designers brought together for an intensive one- or two-day period to devise the critical aspects of the brief. If the brief will provide a large number of similar spaces, for example,