The Effects of an Ambiguous, Negative Sign Prompt and a Clearly-Stated Positive Sign Prompt on Intentions to Litter

Cases
Horsley, A. D. (1988). The unintended effects of a posted sign on littering attitudes and stated intentions. Journal of Environmental Education, 19, 3, 10-14.
A literature review revealed that sign prompts can be effective in reducing the amount of litter. In order to further investigate the effects of prompts, a questionnaire was given…

Using a Normative Appeal to Control Litter at a Public Swimming Pool

Cases
Reich, J. W., & Robertson, J. L. (1979). Reactance and norm appeal in anti-littering messages. Journal of Applied Social Psychology, 9, 1, 91-101.
A literature review revealed that a statement that puts an extreme demand on a person is likely to elicit the undesirable behavior. On the other hand, a statement that creates a n…

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