In our society, deaf children are confronted to the problem of communication with all their surrounding. The technology of cochlear implant gives the possibility to deaf children to access to the comprehension of hearing people and so also to access to oral language to be understood. This technology is used all around Europe, not at the same level, because of the cost, but more and more children can benefit from the cochlear implants. Specialised institutions for deaf ensure the rehabilitation process necessary to improve the comprehension and oral language (multidisciplinary team composed of ENT specialists, neuropsychologists, speech therapists, social workers, etc. )In the same time, the development of this technology has revealed that 30% of the beneficaries can not develop oral language, and so revealed neurolinguistic disorders. It is very difficult to assess and to quantify some of these disorders. The work of specialists requires significant multidisciplinary cooperation and regular observations. This project will enable this collaborative work to give at EU level a better understanding of practices, explorations and materials used in the support of these children. Even though the objective is to produce a protocol of assessment and rehabilitation for a multidisciplinary team to improve the support of these children, this step of explorations is very important to get the good knowledge of the situation in Europe. We will develop two main times of training for participants, one of this event will be to understand the explorations of all the partners and to introduce the question of language disorders to define a consent on the definition. The 2nd one will be more focused on clinical cases, giving a good comprehension of the situation. That will provide a presentation of practices and explorations at EU level, with the implementation of a canadian partner, who get better results in the development of oral language. Their practicies and the North American situation will provide an added-value in the comprehension. In Montreal, Institut Raymond Dewar which follows the children with cochlear implants has pointed out only 3 situations of problems of development of oral language among the 108 deaf children implanted between 2015 and 2018. Such results are great opportunities for our partnership to know more about what is working practically. 20 participants will attend each training event - they will be representative of the question in their organisations and there will be ENT specialists, neuropsychologists, psychologists, social workers, speech therapists, specialised teachers, all the professionals which form the multidisciplinary team in the support of these children. The outcomes of the project will give the possibility to continue in the development of a protocol of assessment and rehabilitation for professionals (participants mentioned) working with these children, in a development of innovation, for the benefit of deaf children and their parents.