On the present website, three different learning material types are distinguished (see the categories mentioned below). By clicking on one of the categories, all materials that belong to that category are displayed. A clarification of each category is given after the link.

• Online and interactive: this material can be used only online, so an active connection with the Internet should be available.

• Downloadable and interactive: this material can be used both online and off-line. When used online, an active connection with the Internet should be available. When used off-line, the material should have been downloaded and installed, after which the material can be used without active Internet connection.

• Downloadable and not demanding for interaction: this material, e.g. a document or video, is to be downloaded once, after which it can be used without active Internet connection. It does not demand for online interaction.