Choose... Pre Day 1 - Rationale for visualization sequence Pre Day 1 - Using 2D drawings to represent 3D images Pre Day 1 - Teaching the skill of spatial visualization Pre Day 1 - The risk of a scripted lesson plan Pre Day 1 - Components of the lesson plan Pre Day 1 - Ways to establish classroom discourse Post Day 1 - Explanations and justifications from day 1 Post Day 1 - Curricular decision based on students’ work Post Day 1 - Evolution of norms for explaining answers Post Day 2 - Filling boxes led to multiplying layers Post Day 2 - Use of real-life context to engage students Post Day 3 - Activity helped to develop spatial visualization Post Day 3 - Further development of multiplication strategy Post Day 3 - Reaction of regular classroom teacher Post Day 3 - Two teachers discuss the use of discourse

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Pre Day 1

• Rationale for visualization sequence
• Using 2D drawings to represent 3D images
• Teaching the skill of spatial visualization
• The risk of a scripted lesson plan
• Components of the lesson plan
• Ways to establish classroom discourse

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Post Day 1

• Explanations and justifications from day 1
• Curricular decision based on students’ work
• Evolution of norms for explaining answers

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Post Day 2

• Filling boxes led to multiplying layers
• Use of real-life context to engage students

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Post Day 3

• Activity helped to develop spatial visualization
• Further development of multiplication strategy
• Reaction of regular classroom teacher
• Two teachers discuss the use of discourse