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Objective. Acute pain is frequent and underestimated in older persons, especially when they suffer from cognitive impairment. Algoplus is an observational scale for acute pain evaluation, validated in French in older persons with communication disorders. We present the validation by an international expert team of the Algoplus scale in five languages: English, Spanish, Italian, Portuguese, and Turkish. Methods. A total of 181 older consecutive patients were included in five countries (Spain, Australia, Italy, Portugal, and Turkey). Test-retest and interrater reliabilities were determined by weighted kappa coefficient for each item and internal consistency by Kuder-Richardson-20 (KD). Results. Regarding test-retest reliability, the kappa coefficient for the five items ranged from 0.68 to 0.84. Inter-rater reliability kappa values ranged from 0.64 to 0.82. Internal consistency was indicated at a KD-greater than 0.6. Satisfaction was good to excellent for all teams. Results show that reliability tests are good to excellent for all items of Algoplus. Conclusions. This study shows evidence that Algoplus is an acceptable, reproducible, reliable, and easy-to-use tool. It provides a unique opportunity to include the translated Algoplus scale in daily assessment of older persons with communication disorders in many countries. [ABSTRACT FROM AUTHOR]