Collectif Doloplus: twenty-five years supporting the fight against pain in the elderly. Speech and communication disorders among the elderly can be an obstacle in the detection and evaluation of pain. In these conditions, the Doloplus and Algoplus (heteroassessment) behavioural scales should be used. This article provides an overview of the guidelines for using these two scales and the role each has in daily practice. It also shows the impact a high-quality evaluative approach can have on the care provided.