actual
 S/ parameter

 Unrealistic





Quality .

 measured
 parameter

 S acceptable range



 Region of Concern



 Time



 Figure 7.1. A Successional Trajectory. Dotted Line Represents the Actual
 Parameter of Interest, Could It Be Known. The Solid Black Line
 Represents the Parameter as Measured in the Field. The Area Between
 the Two Gray Lines Represents an Acceptable Range of Variation
 Around the Measured Parameter. Above and Below This Area
 Represents a Region of Unrealistic Expectations and a Region of
 Concern, Respectively.