Constant Time Delay

Constant time delay (CTD) is an evidence-based instructional strategy used in special education to teach new skills by gradually increasing the time between the presentation of a cue and the prompt provided to help the student respond. Initially, the teacher or paraprofessional gives the instructional cue and an immediate prompt to ensure the student responds correctly. After the student has demonstrated success with the immediate prompt, a predetermined delay (usually 3-5 seconds) is introduced before the prompt is provided. This allows the student time to attempt the task independently while still offering support if needed. Constant time delay helps reduce reliance on prompts over time, encouraging greater independence and confidence in skill acquisition. It is particularly effective for students with disabilities, as it provides structured learning opportunities with a gradual shift toward independent performance.