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.
Publisher. A+E Networks. Franklin Delano Roosevelt, the longest serving president in American history, dies of a cerebral hemorrhage three months into his fourth term. In 1932, at the height of the Great Depression, Governor Roosevelt of New York was elected the 32nd president of the United States.ooseveltâs unparalleled 13 years as president led to the passing of the 22nd Amendment to the U.S. Constitution, which limited future presidents to a maximum of two consecutive elected terms in office.