The document discusses the role of voluntary approaches in regulation. It notes that regulations are not always effective due to assumptions, lack of knowledge, and implementation issues. A case study on nitrate regulations found large differences between predicted costs/benefits and actual outcomes. Voluntary approaches have strengths like partnership and flexibility but also weaknesses like variable commitment and implementation. Effective voluntary approaches require clear objectives, decision processes, measuring outcomes, and recording activities. The regulatory environment involves evidence, predictions, values and implementation at multiple levels. The state should optimize well-being, set objectives, measure outcomes, and provide guidance while voluntary approaches address issues flexibly.