This is a very key principle in creating a cohesive design! Using repetition will create unity throughout your project. For example, notice on front page of the newsletter below how the same fonts are repeated for similar purposes. The font for each article title is the same as the font for the newsletter title. The text font is all the same. The layout utilizes the same look for each article heading – title, author, the line below.
Click here to view a sample of the assignment pages I made my students this year. I kept this principle in mind when designing these as well.