EIA regulations are often excellent in principle, but more difficult in practice. At times there is pressure to shortcut the process on the part of interested parties (notably the industry), and EIA processes often do not deal well with impacts that are difficult to identify (such as those that are indirect), difficult to quantify (such as those on culture), those that are cumulative in nature (due to many small developments rather than a single large development), and those that require lengthy periods before being detected. There is a frequent argument by property development interests that small-scale change in a heritage environment, such as the loss or alteration of a single building, is insignificant. However, experience has shown that the cumulative effect of what can be seen as small-scale changes can have a significant impact on the heritage value and character of an area or landscape. Most heritage resource management activity attempts to influence the level and pace of change in order to maintain the value of the artifact itself or the larger environment in which it is situated. A joint project by the (Canadian) Training and Technology Transfer Program (TTTP) and the Minister of the Environment in Cambodia illustrates application of an EIA process at Siem Reap, the community closest to Angkor Wat, with a specific focus on cumulative effects. Cambodian environment and tourism officials identified a range of environmental issues that face Siem Reap as it further develops its tourism potential, including sanitation, sewage, availability of clean water, and river quality.