Effects of Two Levels of Procedural Fidelity with Constant Time Delay on Children's Learning

The purpose of this study was to compare the effects of constant time delay delivered with high procedural fidelity to constant time delay with high procedural fidelity on all variables except delivery of the controlling prompt (i.e., on a mean of 44% of the trials, the controlling prompt was not delivered when it should have been provided). Six preschool children with disabilities were taught to identify photographs in two alternating conditions (e. g., high procedural fidelity and low procedural fidelity). An adapted alternating treatments design was used to evaluate the instructional conditions on the effectiveness and efficiency of instruction. In addition, daily measures were taken of the teacher's implementation of each step of the constant time delay procedures which indicated that the two conditions were implemented as planned. The results indicate that both conditions were effective for four children; for three of these, the high procedural fidelity condition resulted in more efficient learning. For the fifth child, the high-fidelity condition resulted in criterion level responding, but the low fidelity condition did not. However, when the high fidelity procedure and trial-by-trial reinforcement were used for the low-fidelity stimuli, these abo were acquired. For the sixth child, neither procedure was effective; thus, the high fidelity condition was used alone and resulted in learning. The results are discussed in terms of using the constant time delay procedure and studying the procedural fidelity of other strategies.