Adults with intellectual disability exhibit challenging behaviour more frequently than the population with typical development. Challenging behaviour influences social inclusion, quality of life, and the functioning of a person with intellectual disability (here in after referred to as ID). Functional behaviour assessment (here in after referred to as FBA) is an effective and scientifically-based way of reducing individual challenging behaviour. It allows you to determine the function or purpose of challenging behaviour and the identification of environmental factors associated with challenging behaviour. Two types of methods are used in the FBA process: indirect and direct. It is crucial to explore the degree of consistency between the methods, as the need for rapid and effective techniques based on determining the function of challenging behaviour is increasing. The purpose of this master's thesis is to examine the consistency between the results obtained using both methods. A multiple case study included three adults with moderate ID, showing different forms of challenging behaviour. Data was collected using indirect (review of documentation, Functional Assessment Interview and Motivation Assessment Scale) and direct methods (direct observation using the A-B-C behaviour analysis scheme). The research showed a higher degree of consistency between the findings relating to the function (purpose) of the challenging behaviour and the topography (form) of the challenging behaviour. In the study, we identified the same environmental factors that influence the occurrence of challenging behaviour using both FBA methods. The study also showed a lower degree of consistency between data relating to the frequency, duration, and intensity of challenging behaviour using both FBA methods.
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