Some profs like to use chalk on a chalk board only and some like to mix it up by utilizing a projector and chalk. Still, others like to use just the computer with power point and utilizing the computer with an IDE. I tend to like the style of just chalk only or the style of chalk and computer with IDE. Using power point tends to make the learning process not as enjoyable, but I am sure others prefer power point. Just a matter of taste. I will tell you that the more advanced classes only use chalk. I am not really sure why, but this is what I have noticed. In some cases, they use a white board with color markers!