Professional interior designers use a balance of analytical and creative skills in combination with a broad range of technical knowledge to shape interior environments that satisfy the functional, spatial and aesthetic requirements of a wide range of end users in all building types. Ultimately, professional interior designers identify, research and creatively solve problems related to the function of interior environments in order to enhance quality of life while protecting public health, safety, and welfare. Interior designers frequently work in integrated design services teams with other design professionals. Interior designers provide pre-design services such as evaluation of prospective tenant lease space, feasibility studies and programming, which is the development of a program of space needs with descriptions of environmental qualities to guide design decisions. When developing solutions for interior spaces, interior designers consider a variety of factors, including spatial attributes, construction, material properties and energy consumption, as well as contextual factors such as precedent, building and site location, and behavioral and cultural pattern of use. In addition to determining the shape and other qualities of space, interior designers select, specify and determine placement for materials, fixtures, finishes and furnishings. Designs are communicated through physical and digital models and hand-drawn or digitally produced images.