Before revision: For example, since the publication of Éric Boëda's definition of six nondisassociable criteria for Discoidal debitage, numerous variants have been proposed, and many authors have argued for the presence of Levallois concept(that Eric defined from features of the Levallois Technique ) even when those six criteria were not met.
After revision: For example, since the publication of Éric Boëda's definition of six nondisassociable criteria for Discoidal debitage, numerous variants have been proposed, and many authors have argued for the presence of Levallois concept(that Eric defined from features of the Levallois technique ) even when those six criteria were not met.