Hazard and operability studies Event and fault tree analysis Consequence modelling value of the environmental aspect that will be lost or disturbed as the result of an activity, and where possible its change in value after the activity is undertaken. The principle of evaluation techniques is that they place a value on an environmental aspect in some location where it will be affected by the activity. The evaluation is usually made in terms of an index based on several characteristics of the environment which are considered to contribute to or detract from the value of the environmental aspect in question. Visibility techniques form a group which cannot eas ily be categorized in either of the other types. These techniques are used in landscape assessment for determining the zone from which an activity will be visible.
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