Autism spectrum disorders are developmental disorders which occur in 1 of 150 children. The higher frequency of diagnoses in relation to past decades is caused among others by evolution of the diagnostic process. In this work the authors describe the diagnostic process and instruments used during the assessment. Most of them are not used in Poland. Some, however, as the E-1 and E-2 forms, CARS and PEP-R were translated into Polish but none of them meets all the requirements of tests such as reliability, validity, objectivity, standardization and cultural adaptation.
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