We can use simulated ranges of conditions to learn about visitor preferences. Â Below, I show a series of images I developed to depict one potential aesthetic impact to wilderness recreation. Â It is a nice, reliable, quantitative, repeatable technique for basing difficult and controversial management decisions on data. Â Often used in people per viewscape/shed (PPV) and people at one time (PAOT) crowding measures. Not sure how it works for protecting your park, forest or refuge? Contact my research group. ZERO CONTRAILS VISIBLE FEW CONTRAILS VISIBLE SOME CONTRAILS VISIBLE MORE CONTRAILS VISIBLE MANY CONTRAILS VISIBLE VERY MANY CONTRAILS VISIBLE Pretty cool, huh?