* Natural development: Deaf communities naturally create their own sign languages for communication.
* Influence from other sign languages: LSF shares similarities with other sign languages, including those from neighboring countries.
* Formalization efforts: In the 18th and 19th centuries, educators and institutions began to codify and standardize LSF, leading to the emergence of specific sign systems.
Therefore, it's inaccurate to attribute the invention of LSF to a single individual. Instead, it's a product of the Deaf community's collective creativity and the evolving needs of their communication.