Abstract Tiering of information and decisions from more strategic plans to more specific projects (and sometimes the other way) can streamline plan-making and assessments, and improve decisions at each planning tier. In particular, it can lead to more consistent and comprehensive impact mitigation at the lower tiers. In practice, however, tiering of assessments is carried out only sporadically. This paper reviews the international literature and case studies on Strategic Environmental Assessment (SEA) and Environmental Impact Assessment (EIA) tiering, and presents the findings of interviews with 14 SEA/EIA experts. It concludes that a conscious and explicit transfer of information from the SEA level, and an explicit receipt of this information at the EIA level are necessary prerequisites for effective tiering. SEAs must be carried out with local actions in mind, in order for mitigation measures to support environmental protection on the ground. Lower-tier decision-makers must also be willing to be bound by decisions by the higher-tier SEA, focusing on implementation of these decisions.

中文翻译：

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“成熟的决定”：环境评估的分层

摘要 将信息和决策从更具战略意义的计划分层到更具体的项目（有时是另一种方式）可以简化计划制定和评估，并改进每个计划层级的决策。尤其是，它可以在较低层实现更一致和更全面的影响缓解。然而，在实践中，评估的分层只是偶尔进行。本文回顾了关于战略环境评估 (SEA) 和环境影响评估 (EIA) 分层的国际文献和案例研究，并展示了对 14 位 SEA/EIA 专家的访谈结果。它的结论是，从 SEA 级别有意识和明确地传输信息，以及在 EIA 级别明确接收这些信息是有效分层的必要先决条件。策略性环境评估必须在考虑当地行动的情况下进行，以便采取缓解措施来支持实地环境保护。下级决策者还必须愿意受上级 SEA 决策的约束，专注于这些决策的实施。