The document introduces the BBC micro:bit, a small programmable computer used to teach coding. It explains that the objectives of the lesson are for students to be able to reproduce a simple "Hello World" program, compile and flash it onto the micro:bit; extend the program to be unique; and create their own code by investigating the programming environment. The document then describes the features of the micro:bit and includes a video and instructions for an in-class activity where students will code, compile and flash a simple message onto the micro:bit.