Cheat Sheet about readability
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Readability describes, how easy text can be understood.
There are some numbers which help assess it:
- Simple words and sentences are easier to get than longer paragraphs
- Difficulty level (e.g. Flesh-Kincaid index or Gunning fox)
- Line length
- Kerning
- Tracking
- Alignment
- Leading
- Hierarchy
- Contrast
I'll explain the typographic terms above in another place and a link to it.