This study examined the development and technical adequacy of the Interventionist Knowledge and Skill Survey (IKSS), a self-assessment used for understanding the degree of knowledge and skills associated with interventionists working within a multitiered system of support (MTSS). A national sample of 600 school psychologists and school counselors completed 30 Likert-type items pertaining to interventionist knowledge and skills for MTSS. Item analysis reduced the items to 22, and exploratory factor analysis and a parallel analysis identified four factors: Intervention Knowledge, Intervention Skills, Intervention Selection and Evaluation, and Consultation and Communication. Reliability analysis of the four subscales was adequate, and several other analyses provided evidence for the validity of the IKSS. Discussion focuses on use of the IKSS for research and practice as well as study limitations. K E Y W O R D S assessment of knowledge and skills, interventionists, multi-tiered systems of support
| INTRODUCTIONThere are various models of school-based prevention and intervention, all of which require knowledge and skills for implementation and student success. Response to intervention (RTI) is a prevention model with a foundation in special education law and allows an alternative method for the identification of a specific learning disability (Kovaleski, 2007).Using a three-tiered model, RTI relies on the creation of a system in which academic underachievement is addressed by school-wide reliance on evidence-based instructional strategies, small group remedial efforts, and individually tailored