Presidential Address -- State of Art of Biology Didactic Research in Europe - An Overview -- Opacity of Radiography, Perplexity of Teachers and Pupils in Primary School -- A Longitudinal Study of Pupils' Understanding of Conditions for Life, Growth and Decomposition -- Plant, Animal or Thief? Solving Problems under the Microscope -- Biology Students' Forming and Justiffing of Opinions on Predictive Genetic Testing. Towards a Practicable and Effective Training Strategy -- The State of Art in Research in Chemistry Education -- Understanding Energy in Nature and Society - What Conception do Swedish Ninth Graders Have? -- The Use of Van Hiele Levels as a Tool in the Development of Curricula for Science Education -- Problems of Communication in Chemistry Classes -- Using Methaphors for Learning to Develop Metacognition in Chemistry Students -- Is an Iron Atom Made of Iron? -- Physics Educators and Physicist: Two Communities Apart? -- Students and the Wave Geometrical Model of the Wave Propagation in a Three Dimensional Medium -- How to Deal with the Concept of Mechanical Energy in Dissipative Systems? A Study on Conceptual Development of First-Year Students in Mozambique -- Problem Solving in School Physics: A Metacognitively Developed Field Study -- Can Untraditional Learning Methods used in Physics Help Girls to be More Interested and Achieve more in this Subject? -- Learning in Basic Electricity: How do Motivation, Cognitive Factors and Classroom Climate Influence Achievement in Physics? -- Teaching Earth Science Today -- From Naive Representations to Scientific Concepts: A Cognitive Survey in the Domain of Earth Science -- Learning Science in the Laboratory: Issues raised by the European Project Labwork in Science Education' -- Generating and Using Information at the Elementary School Level: An Important Dimension of Environmental Education. A Project -- Research Based Evaluation in HOCS-Oriented Science Education and Curriculum Development -- Key Evidence in Testing Hypothesis -- Case Studies on Innovative Types of Labwork in Science Education -- Individual Learning Processes. A Research Programme with Focus on the Complexity of Situated Cognition -- Scientific Languages and Common Knowledge: Is Cultural Integration Possible? -- Science Education and the Popularisation of Science in the New Europe -- Nature of Physics - Teachers' Views -- School Science-Real Science? Personal Knowledge, Authentic Science and Student Research Projects -- School Reform in Italy: Orientation as a Key Aspect for Science Teaching Innovation -- Dilemmas related to Teacher Training for Science Education and Pupils' Action Competence (The MUVIN Project) -- A Framework for Learning to Teach Sciences in Initial Primary Teacher Education -- Teacher Education in Greece: Constructivist Attempts in a Nonconstructivist Environment -- Learning to Teach Sciences. Problem Solving as a Context for Learning -- When does Normative Scientific Behaviour Start? -- Author Index.