Numbers behind sound, pictures and video

Information must be designed so that others can read and use it. A graphical user interface (GUI) uses windows, icons and a pointer: it is easy to learn and shows choices. A command-line interface (CUI) takes typed commands: it needs learning, but it is fast and can be automated. Good design has usability, so people reach their goals easily, and accessibility, so people with different needs can also use it: enough contrast between text and background, a size that can be enlarged, and a text description for each picture. For charts, pick the type that fits the message. To compare amounts, use bars. To show change over time, use a line. To show parts of one whole, use a pie chart. Do not overload a picture: remove decoration that carries no information, use few colours, and label the axes and the units. Test your design with someone who has not seen it.