Multimedia technologies in education.

In general multimedia is the combination of visual and audio representations. These representations could include elements of texts, graphic arts, sound, animation, and video. However, multimedia is restricted in such systems where information is digitalized and is processed by a computer.

Epidemiological study designs.

This chapter illustrates the study designs most frequently encountered in the medical literature. In medical research, either subjects are observed or experiments are undertaken. Experiments involving humans are called trials.