The purpose of this article is to provide the reader with a conceptual understanding of the key elements in a three tiered Response to Intervention (RTI) model. The three tiered model is discussed in terms of how it would be applied in implementing an intervention program to promote the development of reading. The characteristics of interventions, criteria for determining the delivery of services and the role of the school psychologist at each stage are discussed. The article concludes that RTI models are excellent approaches for designing intervention programs and school psychologists have a key role to play in helping to design and implement such programs. Concerns regarding the implementation of such models are noted.