Teachers provide them easier tools for them to understand, such as DTT (Discrete Trial Teaching), TEACH visual aids (schedules and work systems), ABC recordings, modeling, time delay, prompts and discriminative stimulus. Mostly, for a student with speech delay, simple teaching instructions are to use visual supports, plain English, sufficient time for students to answer. Non-verbal students are often supported by using AAC (Augmentative and Alternative Communication) to help communicate in a daily living.