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A speech-language pathologist applies knowledge about communication and swallowing to assessment, intervention and research. The work can include language disorder, speech production or dysphagia, with the relevant tasks depending on the person and setting. Comparing comprehension, production and functional communication prevents one test score from being treated as a complete description of everyday communication. Professional titles and service arrangements vary between jurisdictions. ^[ref]

Speech-language pathology studies and addresses communication and swallowing difficulties across development and adult life. It connects language, speech production, hearing-related communication and the coordination of swallowing with assessment and intervention. A difficulty understanding sentences and a difficulty coordinating speech movements are different possible problems even when both affect conversation. Separating components helps identify what an assessment result or treatment outcome actually measures. ^[ref]