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The challenging behavior of people with intellectual and developmental disabilities (IDD) represents a major obstacle to the habilitation of this population, as well as one of the most erosive components for caretakers working with this population. The controlled multi-sensory approach (Snoezelen), which includes an adapted multisensory environment and an enabling therapist, is becoming increasingly popular in healthcare facilities for individuals with IDD, and considered to enable positive changes in an array of maladaptive behaviors in this population. However, reliable scientific evidence of Snoezelen efficacy is as yet relatively limited, which could be attributed to the non-structured format of traditional Snoezelen intervention that does not lend itself easily to quantitative research approaches. The Snoezelen Therapeutic Intervention (STI) presented here is a structured representation of the Snoezelen treatment …