Rating systems is a performance tool to check how sustainable or green a building is. Some important organizations that are involved are LEED ( Leadership in Energy ad Environmental Design), BREEM ( Building Research Establishment Environmental Method) And WGBC World Green Building Council. Green buildings help better the economy,industry and manufacture. For the rating system the score is high there is benefits like, fundraising goals,and high public relations. Now, world wide the united stated took a while to develop green architecture unlike Germany, Switzerland its a standard building mythology. With all this comes challenges which gives the opportunity for green buildings to prove how efficient they are. One of those is the Living Building Challenge or also known as Net Zero Home. Some strong strategies that green buildings use are Site, Water, Energy, Resources, Indoor Environment and Innovation. Last, there key planning is Charrettes, Tracking, Specifications, Construction Observation, The Rating System.