The functional program formulates operational concepts and principles and specifies functions and procedures envisaged for the proposed hospital or facility. Alternatives are evaluated in terms of functional deficiencies, zoning and departmental relationships, circulation and flow analysis, and capacity of support services.

Once the description of functions and services is completed, every activity and function that will occur in the new facility is taken into consideration to define the space necessary to carry out that activity, including room circulation space. The spatial configuration of the facility is determined by a space program, taking into consideration the flexibility and adaptability to future needs.