Bright and clear poster covering the core principles of Object-Oriented Programming (classes, objects, inheritance, polymorphism!). Perfect for KS3, GCSE, and A-Level Computer Science classrooms. Stick it on your wall for quick revision or as a teaching aid. If it helps your students (or saves you from explaining OOP for the 100th time!), please leave a positive review – it makes us coders smile more than print("Hello World"). A4 JPEG file.