This study aims to identify the difficulties of responding to the Columbia Mental Maturity Scale (CMMS) among Algerian children, a field study carried in the city of Ouargla. This is through the case study and the exploratory-descriptive approach. The sample involved 100 children who were selected by a simple random method from regular primary schools during the school year 2023/2024. The said study attempts to answer the following questions: -What does the Columbia Mental Maturity Scale measure? -What cases does it apply to? -How is it applied? -What are the difficulties facing Algerian children aged 5-7 years in responding to the Columbia Mental Maturity Scale? The end results were as follows: 1-The CMMS is among the tests that measure mental maturity and intelligence in children. It is applied to the age group 4-11 years, to both normal children and children who struggle with some troubles such as the mentally retarded, those who suffer from disabilities and language disorders, as well as those with cerebral palsy. 2-Most of the sample members had correct answers in the first 37 panels. As for the cards in which I faced difficulty where all of the sample members failed to answer correctly, were the panels numbered: 58, 61, 63, 64, 65, 69, 70, 75, 79, 82, 97

Columbia Scale -CMMS-, response difficulties, children