This document discusses visualisation diagrams and their use in planning projects. It explains that a visualisation is a drawing that shows what something will look like when created, and they are used to plan for images, products, costumes, logos, posters, and webpages. Visualisation diagrams can be made digitally using software. The document provides an example of a basic website layout diagram showing common elements like a header, main content, images, and footer. It then gives instructions for students to create a basic mockup of a movie website layout using an online tool.