One of the contractor's many responsibilities is the design and construction of shoring systems, which support the formwork system and construction loads. Improperly designed or constructed shoring systems can be extremely hazardous, leading to damaged concrete or even catastrophic failure. Qualified and experienced formwork designers should develop shoring plans and schedule shore removal. Frequently the designer is a professional engineer who works for the contractor or shoring manufacturer. When necessary, the project engineer or architect reviews these plans for structural adequacy, especially for complex multistory construction. The shoring system is a temporary structure designed to carry both vertical and horizontal loads during construction. These loads include the weight of the fresh concrete, forms, shores and other falsework; construction and equipment loads; and wind loads and other loads. Horizontal shores, such as adjustable beams, trusses, or a combination of both, require special design attention because they distribute greater loads to fewer vertical supports.