Accessibility

When designing applets it is important to allow (as much as possible) for all students to access them.

Fontsize, Color & Contrast

Using large fonts with a good contrast is important. Select a large font-size in Options -> Fontsize before you start designing your applet. You can also use the keyboard shortcut Ctrl + 2 to make all fonts bigger and all lines thicker. Ctrl + 3 will change the default for all new objects to be Black and unfilled.

Ideally use dark colors on a white background and thick lines. Pure Red and Green don't have a very good contrast so you should use some darker versions, eg Blue, Dark Green, Dark Red

If you use colors to distinguish otherwise-similar objects, then consider also using dashed lines for one of them. You can also find websites where you can check whether your color scheme is good, for example http://www.vischeck.com/

Keyboard Shortcuts

Students can use Tab to cycle round the objects in a worksheet you have designed. It is important that you uncheck "Selection Allowed" in Object Properties -> Advanced for the objects you don't want to be selected. There is a keyboard shortcut Ctrl + Shift + D in the desktop version that will toggle this property for objects other than Buttons / Sliders / Checkboxes / Points / Input Boxes.

The arrow keys Left, Right, Up, Down can be used to move Sliders and Points once they are selected.

Space can be used to activate a Button or toggle a Checkbox.

GeoGebra Applets are also fully touch-enabled so students can use applets on a special large tablet if necessary.