![]() The survey was then tested by teachers outside the target sample. The conclusions were also adjusted in accordance with the available classroom observations in order to increase the focus of the study. More specifically, the survey design was based on the review of the literature on cohesion, which increases the relevance of the included information. It should be noted that the development process of the CSS included several precautionary measures aimed at increasing its validity. The reliability and validity of this tool were determined by analyzing the data obtained from a sample of teachers and classroom assistants participating in a two-year fee-for-service contract. The test instrument used by the research team was the Classroom Cohesion Survey (CSS) intended to evaluate the interaction between the classroom assistants and teachers involved in the interaction with children with an autism spectrum disorder. ![]() (2015) is aimed at the evaluation of the test tools proposed for implementation in the special education setting. ![]() The current paper reviews three research studies in the field of special education in order to identify the means of establishing the validity and reliability of the involved test instruments. Depending on the goals of the research team, different approaches can be utilized. Reliability and validity are important characteristics of the test tools used in the research.
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