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title: 1. Prerequisites
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### 1.1. Download and Install IntelliJ IDEA
Download and install either IntelliJ IDEA Ultimate or IntelliJ IDEA Community Edition as described on the [Creating Your First Plugin](/basics/getting_started.md) page.

### 1.2. Check out Community Edition Source Files
Download the IntelliJ IDEA Community Edition source files as described in the IntelliJ IDEA Community Edition [README](upsource:///README.md) file.

### 1.3. Install Required Plugins
Make sure that the bundled *Plugin DevKit* plugin is enabled.
Install and enable [Grammar-Kit](https://plugins.jetbrains.com/plugin/6606-grammar-kit) and [PsiViewer](https://plugins.jetbrains.com/plugin/227-psiviewer) plugins.

### 1.4. Create a Project
Create an [IntelliJ Platform Plugin project](/tutorials/build_system/prerequisites.md).