This study evaluates the differential effectiveness of six different anti-litter procedures in two neighborhood theaters. The procedures used to encourage individuals in attendance to pick up litter and deposit it properly included: providing litterbags, providing litterbags with instructions to use them, providing extra trash cans, showing a special anti-litter film before the feature film, and providing incentives for the appropriate deposit of litter. In both theaters, the incentive procedures resulted in the removal of over 90% of all litter by the children in attendance, a figure far above that achieved by the other procedures investigated.

Self-registration of all users is now required on all Forest Service wilderness and primitive areas in Washington and Oregon. Tlie self-registration system provides better estimates of use and contributes to the safety of users. Tfiis study is based on a sample of 2,000 visitors drawn from self-registrations in the Eagle Cap, Glacier Peak, and Three Sisters Wilderness Areas. from a random sample of cards deposited at the 76 self-registration stations located within the three areas. Tests of the effectiveness and representativeness of the self-registration system suggest that about 75 percent of all wilderness visitors register, with the nonresponse concentrated among horseback riders, fishermen, hunters, solitary visitors, and frequent or long-time visitors to the area (Wenger 1964a; Wenger and Gregersen 1964). Conversion factors have been computed to account for the under-representation of such visitors when compiling estimates of use. Wilderness users are typically young to middle-aged adults, but older users are frequently encountered. Hikers near Cascade Pass in the Glacier Peak Wilderness.

This study evaluates the effectiveness of an incentive procedure designed to induce litter collection in a large forest campground. Children in the campground were offered their choice of a variety of reinforcers for picking up and properly disposing of litter. The procedure resulted in a sharp decline in four types of litter planted in the campground.

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