**Course Title:** Introduction to Programming with Scratch **Section Title:** Events and Message Broadcasting **Topic:** Understanding events: When green flag clicked, when sprite clicked **Introduction** In this topic, we will delve into the world of events in Scratch. Events are triggers that make things happen in our programs. We will explore two essential events: "When Green Flag clicked" and "When sprite clicked". Understanding these events will help you create more interactive and engaging projects. By the end of this topic, you will be able to use events to control the flow of your programs. **What is an event?** In Scratch, an event is a specific occurrence that triggers a script to run. Events can be triggered by various actions, such as clicking a sprite, pressing a key, or receiving a message. Think of events as signals that tell your program to do something. **When Green Flag Clicked** The "When Green Flag clicked" event is one of the most basic events in Scratch. This event triggers a script to run when the green flag is clicked. To use this event, follow these steps: 1. Go to the "Events" category in the Scratch blocks palette. 2. Drag the "When Green Flag clicked" block onto the Scripts area. 3. Attach a script to this block, such as a sequence of Motion or Looks blocks. Here's an example: * Create a new Scratch project and add a sprite. * Go to the Scripts area and add the "When Green Flag clicked" block. * Attach a sequence of Motion blocks to make the sprite move across the stage. * Click the Green Flag to run the script. [View an example project on Scratch: "When Green Flag clicked" Event Example](https://scratch.mit.edu/projects/141542641/) **When Sprite Clicked** The "When sprite clicked" event triggers a script to run when a specific sprite is clicked. This event is useful for creating interactive games and animations. To use this event, follow these steps: 1. Go to the "Events" category in the Scratch blocks palette. 2. Drag the "When sprite clicked" block onto the Scripts area. 3. Select the sprite you want to trigger the script. 4. Attach a script to this block, such as a sequence of Looks or Sound blocks. Here's an example: * Create a new Scratch project and add two sprites. * Go to the Scripts area and add the "When sprite clicked" block for each sprite. * Attach a sequence of Looks blocks to make each sprite change its appearance when clicked. * Click each sprite to run the scripts. [View an example project on Scratch: "When Sprite Clicked" Event Example](https://scratch.mit.edu/projects/141542644/) **Key Concepts** * Events are triggers that make things happen in our programs. * The "When Green Flag clicked" event triggers a script to run when the green flag is clicked. * The "When sprite clicked" event triggers a script to run when a specific sprite is clicked. **Practical Takeaways** * Use the "When Green Flag clicked" event to start your program when the green flag is clicked. * Use the "When sprite clicked" event to create interactive games and animations. * Experiment with different events and scripts to create more complex and engaging projects. **What's Next?** In the next topic, we will explore how to create interactions between multiple sprites using events. You will learn how to use broadcast and receive blocks to send messages between sprites and trigger scripts to run. **Leave a Comment or Ask for Help** Have any questions or need help with understanding events? Leave a comment below, and we'll be happy to help.