Five simple steps to better typography by Mark Boulton
Solving the design problem
Let's start by addressing the root of the decision to set type in different weights - solving a design problem. I mentioned that this problem stems from two main areas:
- An aesthetic problem. This is where the designer sets type differently to add style or solve some kind of visual or compositional issue.
- A content problem. The designer needs to set a different weight because the content dictates it. The language of the content may dictate special typographic treatment, the tone of voice may be different, it may be a quote, it may be a structural device such as folios.
There may be other reasons as well, but I believe these are the main cause.
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http://www.markboulton.co.uk/journal...graphy_part_5/