Often a rating tool can be linked back to common aspects with other systems, often depending on the particular influences upon each property market. Many rating tools have been modified and adopted from earlier models that were originally developed in other countries. For example it is possible to trace many systems back to the LEED and BREEAM rating systems (figure 4). The benefits of having
a common foundation may assist with moving towards an internationally accepted rating tool, especially when there are recent signs of change and compromise. For example it is reported that three of the most common rating tools, namely BREEAM, LEED and Green Star, are seeking to develop common metrics which will assist international stakeholders to compare buildings in different cities using an ‘international language’ (Kennett 2009).
Figure 4. LEED and BREEAM based Rating Tools