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Researchers struggle to understand the relationship between science and policy positions, especially the complicated interplay among the various factors that might affect the acceptance or rejection of scientific information. This article presents a typology that simplifies and guides research linking scientific information to policy positions. We use the typology to examine how characteristics of both scientific information and policy actors' existing policy positions affect the likelihood of changing, maintaining or reinforcing those policy positions. We analyse data from surveys conducted in 2015 and 2017 of policy actors engaged in contested policy debates over shale oil and gas development in Colorado, US. Our findings confirm expectations that policy actors will most likely maintain and reinforce their policy positions in response to scientific information. Our data also show that changes in policy positions depend on policy actors' risk perceptions, perceived issue contentiousness, networks and experience with science.

The way in which public policies are composed may lead to conflicts that manifest in an extended policymaking duration. This paper explores the associations between policy composition and the relative duration for policies to be adopted in 15 U.S. state legislatures. We treat policy passage duration as an indicator of policy conflicts in the legislative process. We adapt the institutional grammar tool (IGT) to examine how 168 oil and gas development policies are composed and gauge the association between the content of these policies and the speed of their adoption. We find policies that are more stringent, contain more constitutive rules, target issues related to oil and gas operations or tax and finance take relatively longer to pass. These findings offer theoretical insights into the relationships between policy composition and policy adoption duration. They also provide methodological insights on measuring policy design components using a semi‐automated application of the IGT.

Among the policy instruments used to pursue social and environmental goals, voluntary programmes are seen as ‘win‐win’ opportunities. Despite a sizeable literature documenting reasons individuals opt into voluntary programmes, little attention has been paid to why participants are motivated by certain reasons more than others. This article addresses this gap. Using data from a survey of organic producers in the United States Department of Agriculture's organic certification programme, we examine how organic producers’ values relate to their stated reasons for pursuing organic certification. Along the way, we test hypotheses inspired by grid‐group cultural theory, as well as a hypothesis regarding the alignment of participants’ values and the substantive programme domain. Study findings provide consistent support for the value‐alignment hypothesis and mixed support for grid‐group expectations. We conclude by discussing the findings’ implications for voluntary programme theory and empirical programme success.