The Routines-Based Interview (RBI) is useful for developing functional outcomes/goals, for establishing strong relationships with families, and for assessing the family's true needs. In this study, the authors investigated the psychometric properties of the RBI Implementation Checklist, conducted by 120 early intervention professionals, specifically looking at the probability of correct responses on the items as a logistic function of the difference between the person and the item parameters. We selected Rasch analysis (Rasch, 1980) for this study so we could answer questions about both how the measure performed and how the interviewers performed and we related these performances to one another. Results indicate that scores on the RBI Implementation Checklist were reliable. The checklist could possibly benefit from more difficult items to measure the true performance of the few people who had scores higher than the most difficult items and also from additional items that focus on the family.
ISPA—Instituto Universitário de Ciências Psicológicas, Sociais e da Vida, Portugal, Rua Jardim do Tabaco, Lisboa (Dr Boavida); Kentucky Department of Education, Frankfort, Kentucky (Dr Akers); Siskin Children's Institute, Chattanooga, Tennessee (Dr McWilliam); and University of Kentucky, Lexington (Dr Jung).
Correspondence: Tânia Boavida, PhD, Siskin Children's Institute, 1101 Carter Street, Chattanooga, TN 37402 (firstname.lastname@example.org).
This work was funded by National Funds, via FCT—Fundação para a Ciência e a Tecnologia, through research grant SFRD/BD/44286/2008 and is based on the doctoral dissertation of the first author. Tânia Boavida is now at Siskin Children's Institute.
The authors declare no conflicts of interest.