and for the designs to meet the following terms of reference: legacy, comfort, accessibility, and sustainability.[39] The stadiums will be equipped with cooling systems that aim to reduce temperatures within the stadium by up to 20 °C (36 °F), but it is not yet known if this will actually work in the open-air stadiums. Their marketing includes statements describing the stadiums as Zero Waste, and the upper tiers of the stadiums will be disassembled after the World Cup and donated to countries with less developed sports infrastructure.[40][41] Qatar aspires to be compliant and certified by the Global Sustainability Assessment System (GSAS) for all the World Cup stadiums. All of the five stadium projects launched have been designed by German architect Albert Speer & Partners.