Within the real estate industry there have been different efforts to develop a method to measure environmental performance. In the United Kingdom, the most significant method defining and assessing environmental building performance is BREEAM, the BRE Environmental Assessment Method. BREEAM uses a consensus based weighting system to aggregate performance into one overall score for a building, which is then rated on a scale ranging from pass, good, very good to excellent. The main methodology used in the United States is LEED, the Leadership in Energy and Environmental Design Scheme by the US Green Building Council. This is a point-based system, similar to BREEAM, but resulting in buildings being awarded bronze, silver, gold or platinum status.