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.
Thirty percent of participants responded that the "Please save our landscapes: don't litter" prompt would make them think about the litter problem. Furthermore, 20% indicated tha…

Using Proximity of Trash Cans and Ash Trays to Increase Convenience of Separating Litter in a Blacksburg, Virginia Shopping Mall

Cases
Geller, E. S., Brasted, W. S. & Mann, M. F. (1979). Waste receptacle designs as interventions for litter control. Journal of Environmental Systems, 9, 2, 145-160.
The greatest amount of litter separation occurred in the combination astray/garbage can receptacle. On average, 22.19 appropriate items and only 2.64 inappropriate items were dep…

Using Block Leaders and Prompts to Improve Participation in Curbside Recycling in Denver Colorado

Cases
Although all interventions improved particiaptions, it is clearly the block leaders who had the most significant impact on behavior. Fully one third of residents were recycling by…

The Effect of Sign Prompts and Modeling on Encouraging Dog Owners to Pick-up Dog Droppings in Chicago, Illinois

Cases
Jason, L. A., Zolik, E. S., & Matese, F. J. (1979). Prompting dog owners to pick up dog droppings. American Journal of Community Psychology, 7, 3, 339-351.
Only 5% of dog owners picked up after their pets during baseline observations. Sign prompts alone were not effective in encouraging pick up behavior as only 6% of dog owners obey…

Increasing Paper Recycling in Portland Oregon Dormitories Using Incentives and Commitment

Cases
Wang, T. H. & Katzev, R. D. (1990). Group commitment and resource conservation: Two field experiments on promoting recycling. Journal of Applied Social Psychology, 20, 4, Part 1, 265-275.
During the intervention period, the three treatment groups showed a dramatic increase in recycling. Paper recycling for the group commitment, incentive and individual commitment …

Using Information and Prompts to Increase Awareness of an Environmental Product Tagging Program in Grocery Stores

Cases
Linn, N., Vining, J., & Feeley, P. A. (1994). Toward a sustainable society: Waste minimization through environmentally conscious consuming. Journal of Applied Social Psychology, 24, 17, 1550-1572.
The educational pamphlets alone did not increase awareness of the environmental program. On the other hand, 44% reported seeing the sign prompts, 34% saw signs about the product …

The Effects of Sign Prompts and Large Receptacles on Highway Littering in Richmond, Virginia

Cases
Finnie, W. C. (1973). Field experiments in litter control. Environment and Behavior, 5, 2, 123-144.
Overall, litter was reduced by 28.6% when trash cans were present. No statistical differences were found between the highway with sign prompts and the highway without.

The Effects of an Ambiguous, Negative Sign Prompts 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.
Thirty percent of participants responded that the "Please save our landscapes: don't litter" prompt would make them think about the litter problem. Furthermore, 20% indicated tha…

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.
The flyer containing the extreme message elicited the highest frequency of littering of the three handbills. The "Don't Litter" flyer was littered 50% of the time. In comparison…

Encouraging Environmentally Friendly Shopping using Prompts, Commitment and Norms

Cases
Analysis of electronic inventories indicated that the prompts did not increase the purchase of targeted items. That is, items that were identified with shelf-talkers (prompts) as…

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