During 2000–2006, apraxia of speech is consolidated as a motor-planning disorder, with converging evidence from acoustic, kinematic, and perceptual analyses that supports a central role for motor planning deficits in shaping speech production errors. The period emphasizes unified accounts of competing explanations, advances in task-based assessment that distinguish apraxia of speech from dysarthria, and the integration of diagnostic and therapeutic directions. Broadening the clinical landscape, research highlights apraxia of speech as a presenting feature in neurodegenerative disease and underscores the need for evidence-based treatment guidelines, thereby guiding standardized clinical practice and the design of targeted interventions.