Current research indicates that students with enhanced knowledge networks are more effective in learning science content and applying higher order thinking skills in open-ended inquiry learning. This research examined teacher implementation of a novel teaching strategy called ''web diagramming,'' a form of network mapping, in a secondary school earth science class. We report evidence for student improvement in knowledge networking, questionnaire-based reports by the students on the merits of web diagramming in terms of interest and usefulness, and information on the collaborating teacher's perceptions of the process of implementation, including implications for teacher education. This is among the first reports that teachers can be provided with strategies to enhance student knowledge networking capacity, especially for those students whose initial networking scores are among the lowest.Keywords Cognitive structure Á Earth science learning Á Knowledge networksThe organization of students' science knowledge in memory has been widely studied using a variety of constructs including knowledge hierarchies and network diagrams such as concept maps or mind maps and the literature base is vast (e.g., Longo et al. 2002;Nesbit and Adesope 2006;Okey and Gagne 1970;Ring and Novak 1971;Shavelson and Stanton 1975;Wilson 1994 of recursive linkages (cross linking) among domain-specific content in the stream of narrative during recall. Current flow-map evidence indicates that there is a strong correlation between students' ability to network science information in memory and related learning outcomes, including amount of conceptual knowledge, higher order thinking skills, and success in inquiry learning (e.g., Anderson et al. 2001;Bischoff andAnderson 1998, Bischoff andTsai 1998;Wu and Tsai 2005). However, there is substantially less information in the published literature on how teachers can enhance students' networking of knowledge in memory and the extent to which teachers find these potential teaching strategies to be useful in improving students' network of knowledge in memory. For the purposes of this research, knowledge network is defined as the extent of logical connections made among domain-specific content units (categories, concepts, principles, etc.) represented by verbal referents (e.g., words and phrases) in knowledge retrieved from memory. It is a theoretical construct inferred from the organization of information in a student product (e.g., flow map analysis of narrative, or student constructed concept maps) that serves as proxy evidence for the organization of knowledge in memory.This research describes a new approach to enhancing secondary school students' organization of earth science knowledge using a teaching device called a ''web diagram,'' a modified form of mind map or concept map and presents evidence for its applicability and implications for teacher education. Overall, there is less educational research in the earth sciences compared to other disciplines. However, there are increasing reports ...