1) Direct reason: I mentioned both way (Word and Powerpoint). Many student considered that they have to create powerpoint other than word. If I will charge both, it would be too heavy. Therefore, I decided to dispose word, focusing only on powerpoint.
2) Educational Reason: One-page powerpoint is quite common way in real Business. How to select information, how to appeal what, they are reflection of author's sense and practice.
3) More practical reason: Powerpoint is more difficult to COPY & PASTE than word.