• Stuttering therapy evaluation and outcome measurement became a central methodological focus, integrating frequency measures, attitude scales, and transfer/maintenance effects across diversified interventions (DAF, operant procedures), with longitudinal follow-ups [2], [9], [10], [11].

• Language development in autism and related disorders spurred intervention work emphasizing signed speech, parental input, and nonverbal–verbal integration, illustrating how gestural systems catalyze spontaneous speech and how mothers’ speech patterns influence child outcomes [4], [6], [7], [15].

• Educational and life-course outcomes of articulation and language disorders were explored via long-term follow-ups and prevalence/recovery studies in school settings, highlighting persistence, recovery rates, and educational performance as core outcomes [1], [5], [3], [20].

• Parental and social-contextual dimensions shaped stuttering and speech-disorder treatment, with attention to parental attitudes, knowledge, and perceived therapy impact as a key determinant of help-seeking and reported outcomes [14], [8], [10].