In the first activity the students will be asked to inspect the code and identify code blocks they are familiar with. In this way they will learn to deconstruct a computer code into its building blocks. They will also be asked to identify new blocks of code, as well as “new” code.

• Watch the video on how to decode a model
• Review familiar and new command blocks
  
• Decode the Greenhouse Gas model
• Check your understanding of the Greenhouse Gas model
  
  

Watch a video on how to decode and trace a program's execution

Review CS Concepts: 

Review the CS concepts you learned in Module 1 using these two documents

• CS Concepts Guide
• StarLogo Nova Blocks Guide
  

then review these newer commands and concepts:

• New command blocks
  
• Create-do block
  
• If/else block
  
• Procedure block
  
• Call procedure block
  
• Line graph
  
• Data box
  
• Delete block
  
• New CS concepts
• Program loop and execution order – what calls what? 
  
• Demonstrate how to trace execution of the program starting with the Setup button. Trace execution of the program starting with Run button. Clicking the setup button in Spaceland causes the execution of this procedure in the World.

Decode the Greenhouse Gas model

• Open the code blocks document and save it to your Google Drive.
• Decode the model a piece at a time: Sun, Solar Energy, Heat, Reflected Energy or The World.
  
• Add a description of what each agent’s procedures do in the form.
  

Check your understanding of the Greenhouse Gas model 

Quiz questions:

Reflection:

Reflect on the limitations of this model then post your reflection and upload your code blocks document to your portfolio in the section "SL Nova Projects- Earth" under the heading "Base model decoding."