Though there is no single, thoroughly researched and widely practiced âmodelâ of the RTI process, it is generally defined as a three-tier (or three-step) model of school supports that uses research-based academic and/or behavioral interventions.The Three-Tier Model is described below.hough there is no single, thoroughly researched and widely practiced âmodelâ of the RTI process, it is generally defined as a three-tier (or three-step) model of school supports that uses research-based academic and/or behavioral interventions. The Three-Tier Model is described below.
Franklin Delano Roosevelt is the US President who served the greatest number of years in office. He was President from 1933 to 1945, which was 12 years. Currently, Preside â¦ nts are constitutionally limited to two consecutive terms, adding up to only 8 years.
Franklin Delano Roosevelt (FDR) is the only us president in history that served more than two terms in office. In fact, he was elected to four full terms. Unfortunately, Roosevelt died during his fourth term, and the remainder was served by his vice president, Harry S Truman. Shortly after, in 1947, the 22 Amendment of the United States Constitution was passed. It stated that a president cannot serve more than 10 years or two consecutive terms in office.