Problem: Reword simple and concise.
Several components of this program support internal validity, meaning the data are likely to reflect a true functional relation between the intervention and student performance. First, the program includes clear operational definitions of the target behavior (selecting the corresponding letter given a letter sound) and objective mastery criteria (16 letter sounds, independent responding, three consecutive trials). This reduces ambiguity in measurement and improves reliability. Second, the use of Discrete Trial Training with an errorless teaching approach strengthens internal validity. Immediate prompting and systematic prompt fading (FP → PP → GP → I) reduce the likelihood that errors or extraneous variables influence responding, increasing confidence that improvements are due to instruction rather than chance. Third, the program specifies consistent SD delivery, materials, and response requirements (field of three letters, 15-second response window, defined error correction procedure). These controls limit variability in implementation, supporting experimental control. Need Assignment Help?