Ms. Heller introduced multiplying fractions to Eric and Anu. She understood that when teaching a new behavior, she neede

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Ms. Heller introduced multiplying fractions to Eric and Anu. She understood that when teaching a new behavior, she needed to provide a reinforcer every time the behavior was performed correctly. Within nine sessions the students were accurately adding fractions with like denominators. Ms. Lowell then stopped the continuous reinforcement in order to allow internal reinforcers and self-esteem to take the place of external reinforcer. When she did the next weekly maintenance check, the students were no longer adding accurately.
A. Why is the Teacher's plan not working