Definition reprinted with permission from Hood, Stephen B. (editor) available from Stuttering Foundation of America: [amazon 093338825X inline]
Language formulation involves the ability to generate utterances that are correct with such things as grammar, word order and vocabulary. For persons who experience difficulty receiving and/or expressing linguistic information, the associated stress frequently exacerbates disfluency in normal speakers and increased stuttering in stutterers. As utterances become longer and more complex with respect to syntax, they become more difficult.