Teach students how programs make decisions with this structured, classroom-ready lesson on Python if statements for Computer Science Principles.

In Lesson 4.3: If Statements, students learn how Boolean conditions control program execution using single-path decision making. Through guided notes, flowchart reasoning, code tracing, and predict-the-output practice, students develop a strong mental model of how if statements work before moving on to if / else logic.

This lesson is a critical foundation for all future conditional logic and is designed to reduce confusion around indentation, execution flow, and condition evaluation.

✅ What’s Included

✔ Student worksheet (printable & digital-friendly)
✔ Guided notes explaining if statement structure
✔ Vocabulary check (matching format)
✔ Flowchart-based reasoning activities
✔ Code tracing & predict-the-output questions
✔ JDoodle Try It Yourself Python activity
✔ Reflection prompts focused on decision making
✔ Full Teacher Guide with pacing, misconceptions, and answer key

🧠 Key Skills Students Practice

• Writing basic if statements
  
• Evaluating Boolean conditions
  
• Tracing execution flow
  
• Understanding indentation in Python
  
• Connecting logic to program behavior
  

🧑‍🏫 Teacher-Friendly Design

• No prep required
  
• Clear structure and consistent formatting
  
• Sub-ready and classroom-tested
  
• Designed specifically for CSP Big Ideas
  

📌 Programming Language: Python
📌 Grade Levels: 9–12, Higher Education, Adult Education
📌 Time Required: 1 class period (45–60 minutes)