Scaffolding has multiple functions and a variety of configurations, enabling it to meet the needs of virtually any construction or maintenance project. One function of a scaffolding system (sometimes referred to as staging) is to provide safe temporary access for workers and materials to an elevated area of a building, either interior or exterior, for construction, alteration, or routine maintenance or renovation activities. Scaffolding can also provide safe, temporary shoring for building materials and structural components. Scaffolding has evolved from the very early days of wooden and bamboo structures to sophisticated, and often elaborate, metal structures which require the services of a structural engineer. Without scaffolding, many construction and building repair activities would not be possible.