The Substitution Augmentation Modification Redefinition model is explained with examples in the following chart found on the Technology is Learning website on Google Sites.
SAMR was created by Dr. Rueben Puentedura as a framework to help evaluate how we use technological tools in our learning tasks. In early April, 2017, Dr. Puentedura presented the following slides at the Annual CoSN (Consortium for School Networking) Conference in Chicago, IL.
Common Sense Media has an excellent video that focuses on the question, How do you teach above the line? It focuses on the SAMR model and offers an excellent, albeit brief, breakdown of the purpose and function of SAMR in the classroom.