Introduction to Block Programming (Scratch)

Active learning works for Scratch because students need to physically drag, snap, and test blocks to grasp core programming concepts. Hands-on exploration builds muscle memory for sequencing and problem-solving, turning abstract ideas like loops and events into tangible experiences that stick longer than passive explanation.

• Year 7
• Computing
• 4 activities
• 30 min–50 min

Learning Objectives

1. Identify the function of each major block category (motion, looks, sound, events, control, sensing, operators, variables) within the Scratch interface.
2. Design and demonstrate a simple interactive animation by sequencing and looping basic Scratch blocks.
3. Compare and contrast the visual block-based programming environment of Scratch with a text-based coding language, identifying key differences in syntax and structure.
4. Explain the purpose of event blocks in triggering actions within a Scratch project.
5. Create a project that utilizes at least two different block categories to achieve a specific outcome.

Flipped Classroom

⏱ 30 min·Pairs

Block Exploration: Category Hunt

Students open Scratch and select one sprite. They drag blocks from each category (motion, looks, sound, control, events) to the scripts area, predict effects, then test by clicking the green flag. Pairs discuss and note one key purpose per category in a shared table.

Prepare & details

Explain the purpose of different categories of blocks in Scratch.

Facilitation Tip: During Block Exploration, move between groups to gently correct incomplete stacks before students test scripts.

Setup: Standard classroom, flexible for group activities during class

Materials: Pre-class content (video/reading with guiding questions), Readiness check or entrance ticket, In-class application activity, Reflection journal

• Understand
• Apply
• Analyze
• Self-Management
• Self-Awareness

Flipped Classroom

⏱ 45 min·Individual

Guided Build: Simple Animation

Provide a storyboard for a sprite walking across the stage and waving. Students sequence motion, control, and looks blocks to match. They add a sound block and test, adjusting for smooth playback before remixing a partner's project.

Prepare & details

Design a simple interactive animation using basic Scratch blocks.

Facilitation Tip: In Guided Build, pause frequently to ask students to predict what will happen before they click the green flag.

Setup: Standard classroom, flexible for group activities during class

Materials: Pre-class content (video/reading with guiding questions), Readiness check or entrance ticket, In-class application activity, Reflection journal

• Understand
• Apply
• Analyze
• Self-Management
• Self-Awareness

Flipped Classroom

⏱ 50 min·Pairs

Pair Challenge: Interactive Game

Pairs design a basic game where a sprite chases the mouse, using sensing and forever loops. They add scorekeeping with variables. Groups present one feature, explaining block choices to the class.

Prepare & details

Compare the Scratch environment to other visual programming tools.

Facilitation Tip: For Pair Challenge, assign clear roles so both partners share the coding work and the debugging talk.

Setup: Standard classroom, flexible for group activities during class

Materials: Pre-class content (video/reading with guiding questions), Readiness check or entrance ticket, In-class application activity, Reflection journal

• Understand
• Apply
• Analyze
• Self-Management
• Self-Awareness

Flipped Classroom

⏱ 40 min·Small Groups

Comparison Station: Visual Tools

Set up laptops with Scratch, Blockly, and Tynker open. Small groups spend 10 minutes at each, building the same sequence (move forward, turn), then compare interfaces on a Venn diagram.

Prepare & details

Explain the purpose of different categories of blocks in Scratch.

Facilitation Tip: At Comparison Station, direct students to physically categorize printed block images to reinforce differences in function.

Setup: Standard classroom, flexible for group activities during class

Materials: Pre-class content (video/reading with guiding questions), Readiness check or entrance ticket, In-class application activity, Reflection journal

• Understand
• Apply
• Analyze
• Self-Management
• Self-Awareness

Teaching This Topic

Teach Scratch by modeling curiosity and iteration: show how you fix a mistake in front of students to normalize debugging. Avoid rushing to solutions; instead, ask targeted questions like ‘What happens if we swap this block?’ Research shows that immediate feedback from peers during pair work accelerates understanding more than teacher-led demonstrations alone.

What to Expect

Successful learning looks like students confidently identifying block categories, building functional scripts, and explaining how their code works to peers. By the end, they should demonstrate decomposition by breaking tasks into steps and debugging collaboratively.

Watch Out for These Misconceptions

Common Misconception

During Block Exploration, watch for students who leave blocks unconnected or assume all blocks run simultaneously.

What to Teach Instead

Have students test each lone block by clicking it directly in the editor, then ask them to connect it to a stack to observe the difference in behavior.

Common Misconception

During Guided Build, listen for students who say the animation runs without clicking the green flag.

What to Teach Instead

Pause the class to demonstrate that scripts only run when triggered, then ask pairs to add and test a missing ‘when green flag clicked’ block.

Common Misconception

During Comparison Station, notice students who group blocks by color rather than function.

What to Teach Instead

Ask students to match printed block images to their correct category labels on the wall, using motion blocks as the first example to anchor their understanding.

Assessment Ideas

Exit Ticket

After Block Exploration, ask students to write down one block category they used and describe what kind of action it controls, then explain one difference between Scratch and a text-based language.

Quick Check

During Pair Challenge, circulate and ask each pair: ‘What does this ‘when this sprite clicked’ block do? What happens when you use the ‘repeat’ block here?’

Discussion Prompt

After Comparison Station, pose the question: ‘Imagine you are explaining Scratch to someone who has only ever used a word processor. What are the most important things you would tell them about how it works?’

Extensions & Scaffolding

• Challenge: Ask students to add two custom blocks using the ‘More Blocks’ category to create a new sprite behavior.
• Scaffolding: Provide pre-sorted block sets for students who struggle with category recognition to rebuild a simpler animation.
• Deeper exploration: Invite students to remix an existing project to add a scoring system or multi-level gameplay.

Key Vocabulary

Sprite	A character or object on the Scratch stage that can be programmed to move, speak, and interact.
Stage	The background area in Scratch where sprites perform actions and animations take place.
Script	A sequence of connected blocks that tells a sprite or the stage what to do.
Event Block	Blocks that initiate a script when a specific condition is met, such as clicking the green flag or pressing a key.
Loop	A control block that repeats a set of instructions multiple times, either a specific number of times or indefinitely.