Due to the controversial nature of land application of sewage sludge (biosolids), the development of an Extension program and Extension materials to provide agents and farmers with information on this topic was stalled in its initial stages for several years. Informal evaluation techniques (semi-structured interviews, meeting evaluations, peer-reviews, pre-testing) enabled a consensus-building process with frequent opportunities for constructive feedback, without which technical guidelines and fact sheets might still not exist. One novel aspect of our Extension program and materials related to land application is that they attempt to address social and legal issues in addition to technical issues.
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Krogmann, U., & Gibson, V. (2003). Integrating Development of Extension Materials and Formative Informal Evaluation: Land Application of Sewage Sludge as a Case Example. The Journal of Extension, 41(1), Article 2. https://tigerprints.clemson.edu/joe/vol41/iss1/2