While Teaching His Daughter the Letters of the Alphabet, Vern

While teaching his daughter the letters of the alphabet, Vern would pronounce each letter as he showed it to her and then encourage her to repeat what he said. He then began to pronounce the letters more softly, with the result that she eventually pronounced them on her own just by seeing the letter. In this scenario, Vern applied a method called _________. One problem with this method is that the learning that results from this procedure tends to be (inflexible/too flexible) _________.