The aim of the study was to adapt and try tests for assessing the development of children up to 8 years old, to analyze their suitability to be used in kindergartens and schools of Estonia. The objects of the research were the Controlled Drawing Observation (CDO; Krogh, 1977; modified version CDO-R) for screening child's school readiness and the Psychoeducational Profile-Revised (PEP-R; Schopler, Reichler, Bashford et al., 1990) for diagnostic child's general development. The testing results of the normal sample of children whose mother tongue is Estonian showed that the CDO is suitable for the screening of school readiness at the end of kindergarten, CDO-R at the beginning of the first grade and PEP-R is reliable to be used for the general assessment of the development of children up to 5 years old.