Segmentation of sounds is a technique of separating words into their component sounds and understanding there are individual sounds in the word.
Have 5-10 picture cards of target words that can have the initial sound deleted and still be a word (e.g. deer/ear, feet/eat, farm/arm). Record the words with the initial sound deleted on a multi-message speech device* labeled with the picture and/or the written word. Pick a target word (or use an All-Turn-It Spinner) and the student deletes the initial phoneme by pressing the button on the speech device that corresponds to the new word.