I. Preface.- II. Introduction to the sections.- Part 1. Capturing reasoning about mechanisms - analyzing and evaluating mechanistic reasoning.- Chapter 1. Leveraging machine learning to investigate organic chemistry students' mechanistic reasoning across a corpus of writing-to-learn assignment responses.

- Chapter 2. Students' teleological reasoning: An explanatory escape.- Chapter 3. Reasoning about Alternatives: Contrasting students' mechanistic reasoning for chemical reactions of varying plausibility.- Chapter 4. Towards a wide understanding of mechanisms across science domains: Implications for Science Education.- Part 2. Promoting mechanistic reasoning - implications for supporting mechanistic reasoning.

- Chapter 1. Facilitating Mechanistic Reasoning with Gesture: A study of Two Students' sense-making of heat transfer.- Chapter 2. Design principles for developing and analyzing formative assessments to support mechanistic reasoning.- Chapter 3. Explicating black boxes in the biology classroom for promoting mechanistic reasoning.- Chapter 4. Promoting students' mechanistic reasoning in physics through constructing stop-motion animations: what to consider?.

- Part 3. Processes of constructing mechanistic explanations.- Chapter 1. On the productivity of mechanistic reasoning in elementary science classroom.- Chapter 2. The nature of Mechanistic Reasoning in Chemistry.- Chapter 3. Modality Matters: Exploring and Identifying Mechanistic Reasoning in Computational Modeling in Science Education.

- Part 4. Contribution of mechanistic reasoning to scientific literacy.- Chapter 1. Mechanistic Reasoning In-School vs. Mechanistic Reasoning In-Life.- Chapter 2. Mechanistic literacy across functional health-related daily life decisions.