Mr. hawkins wants abel to learn to purchase a newspaper from a newspaper vending machine. over two weeks, abel purchases newspapers from four different newspaper machines. this is an example of what generalization technique?

This is an example of TRAIN TO GENERALIZE. Generalization is defined as the occurrence of relevant behavior under different, non-training conditions without the planing of the same event in those conditions as has been done in the training  conditions.There are many generalization methods, these include: maximizing contact with reinforcement in the generalization setting, mediate generalization, train to generalize, etc.