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# What is the Coleman-Liau Index?

Developed in 1975 by Meri Coleman and T. L Liau, the Coleman-Liau Index is one of the most commonly used readability formulae.  
  
Classic readability tools involve counting the number of syllables per word and per sentence. Yet, the Coleman-Liau Index doesn't count any syllables.  
  
Coleman & Liau argued that techniques designed to estimate the number of syllables lacked accuracy.  
  
For more information, please read our blog: [Readability and the Coleman-Liau Index](https://readable.io/blog/the-coleman-liau-index/).