Alternative titles: The term "Building services engineering" is also commonly known as "Mechanical & electrical engineering", "Architectural engineering", "Technical building services", "Building engineering", or "Facilities and services planning engineering". The term "Building services engineering" is widely used in Commonwealth countries (incl. United Kingdom, Ireland, Canada and Australia), but in the United States of America, the field is also known as "Building systems engineering", "Architectural engineering" or "Building engineering", though the latter two disciplines generally have a broader scope, also encompassing elements of Structural engineering and more traditional architectural tasks such as room planning and material selection. In India the engineers are known as "facilities planners". In some countries, a "building services architect" is a senior engineer with experience in the integration of electrical, mechanical,fire, hydraulic, security and communications building services, who manages and delivers the integrated detailed design of multiple disciplines so as to ensure that the building is delivered in a "least cost technically acceptable" manner, with emphasis on both the construction costs and the operational costs.