The measurement of cognitive skills of children with multiple functional impairments is a difficult issue for professionals who are involved in their care and in their education. Access to the assessment for these children is complex and the lack of adequate measures and standards usually established with an unselected population prevents the use of conventional tests. The P2CJP, created by a group of academics and clinical psychologists, provides a profile of differentiated cognitive skills. This instrument can be used in order to follow the evolution of the children and also for the identification of the competencies that professionals can use to optimize their development. The first part of the P2CJP (called 鈥淕rille de r茅activit茅鈥? identifies communication behaviors preferred by the child with multiple impairments. The second part of the P2CJP includes eight subscales that measure cognitive competencies. A calibration was performed on 104 young people with multiple disabilities. This standardization permits comparisons between and within individuals. Its use by psychologists working in specialized institutions underlines the advantages and disadvantages of this test for professionals in charge of these children.