It can be seen in Figure 2 that the main screen contains buttons that are linked to the basic components of the selected material. These buttons were designed by using a combination of different elements. Figure 2 shows the main user interface for the program developed. • Text: a clear and easy to read font size and style was utilized. (Bailey et al., 1991) suggested that no more than two or three types and sizes of fonts be used per screen. Garner adds that one font per screen be used unless certain material needs to be emphasized. In this case, varying the size and font of text can be used to attract attention (Gamer 1991).