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Objective: To develop and validate a clinically feasible measure of communication effectiveness for people with any type of communication problem following stroke.

Design: Cross-sectional, interview-based, psychometric study, building on the development phase for construction of the Communication Outcome after Stroke (COAST) scale.

Setting: A community sample from the northwest of England, UK.

Subjects: One hundred and two people with communication problems (aphasia and/or dysarthria) following a stroke, within the previous 4—12 months.

Interventions: Administration of the COAST scale, on two occasions, within a two-week period, and collection of demographic and other data relating to disability, degree of aphasia (where appropriate) and hospital diagnosis of aphasia/dysarthria.

Main measures: Acceptability (missing values), reliability (internal consistency and test—retest reliability) and item analysis …