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THE CONTEXTUAL RATING (CR) <br />After summing the results for each of the three <br />doughnut - shaped zones, with their respective <br />weights, the maximal value of the Contextual <br />Rating for a target tract is about 42. This value is <br />6 x 4 for the innermost zone, plus 6 x 2 for the <br />middle zone, plus 6 x I. for the outer zone. The <br />minimal value of the Contextual Rating is 0, <br />when there is no forest within 2 miles of the <br />target tract in any direction. <br />The Contextual Rating we present here thus <br />combines the advantages of (1) agreement with <br />general features of biological dispersal between <br />patches of habitat, (2) intuitively understandable <br />results, and (3) easy computation by Ardnfo. <br />25 <br />