The article is the first presentation of analysis of psychometric characteristics of the technique Mullen Scales of Early Learning (MSEL) on a Russian-language sample. MSEL is a standardized technique for assessing cognitive development of children aged 0 to 68 months, including assessment of rough and fine motor skills, visual perception and communicative development. Analysis of correlations between the scales of the technique demonstrates relative independence of indices on each scale while showing connection between latent variables being measured. The highest correlation meanings were discovered between the scales which determine the value of general cognitive development which confirms correctness of the structure of the test. Parameters of complexity and discrimination capacity of the tasks were found to correspond to the original version of the technique. Analysis of discrimination capacity showed that scales of fine motor skills and visual perception demonstrate the best discrimination capacity in the middle of the scale. On the scale of rough motor skills less complex tasks situated at the beginning of the scale demonstrate the highest discrimination capacity. Rough motor skills develop earlier than others, therefore this type of tasks is meant for younger children. The discovered indices of complexity and discrimination capacity of statements for the communication scales must be interpreted with care due to the fact that they were tested only on a limited group of older children. Thus the structure of MSEL was confirmed on a Russian language sample. The analysis also demonstrated applicability of MSEL for testing Russian speaking children, including those being raised in institutions.